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[[Image:Coin.png|thumb|right|The artwork used to show cost in coins.]]
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Every card and [[Event]] in Dominion has a '''cost'''. A card's cost is indicated in its lower left corner and an Event card's cost is indicated in its upper left corner. Usually this is some number of [[coin|coins]], symbolized {{Cost|}}.
[[Image:Potion.png|thumb|right|150px|The artwork used to show cost in [[Potion]]s.]]
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[[Image:Debt.png|thumb|right|The artwork used to show cost in [[Debt]].]]
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The '''cost''' of a [[card]], [[Event]] or [[Project]] is the amount that must be paid in order to buy it. A card's cost is indicated in its lower left corner, and an Event or Project's cost is indicated in its upper left corner. Every card, Event or Project costs some number of {{Cost}}, {{P}}, and {{Debt}}. Only relevant cost components are shown, the rest are omitted. If something does not cost any resources (besides a Buy), {{Cost|0}} is shown. To buy something, a player must have the requisite number of {{Cost|}} and {{Cost|P}} unspent, a Buy, and no {{Debt}}.
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The primary function of a card's or Event's cost is for [[buy|buying]] it. In order to be able to buy something, you must have generated at least the requisite number of {{Cost|}} and {{Cost|P}} by playing [[Action]] and [[Treasure]] cards, spending [[coin token|coin tokens]], or buying Events (and not yet spent them on other cards or Events).
  
== Symbols in costs ==
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== Other symbols in costs ==
Most cards include [[Coin]]s in their cost, symbolized {{Cost}}. To buy a card with {{Cost}} in the cost, you must have made enough {{Cost}} during your turn. The primary way of making {{Cost|}} is by playing [[Action]] and [[Treasure]] cards. [[Coffers]] and some [[Event]]s, [[Artifact|Artifacts]], [[Boon]]s, [[Ally|Allies]], and [[Night]] cards provide additional ways to make {{Cost}}.
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The costs of some cards from [[Alchemy]] include a {{Card|Potion}}, symbolized {{P}}, in addition to some number of {{Cost|}} (possibly 0). The {{Cost|}} and {{P}} components of costs are orthogonal; in order to buy a card with {{P}} in the cost, you must have played a {{Card|Potion}} card in addition to sufficient Actions, Treasures, etc. to produce the requisite number of {{Cost|}}.
  
Some cards in [[Alchemy]] include {{Card|Potion}} in their cost, symbolized {{P}}. This may be in addition to some number of {{Cost}}. The {{Cost}} and {{P}} components of costs are orthogonal; {{Cost|1}} is not greater than, less than, or equal to {{P}}. To buy a card with {{P}} in the cost, you must have played a Potion, in addition to having made enough {{Cost}} to pay for the {{Cost}} portion of the card's cost.
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An asterisk (e.g., {{Cost|0*}}) indicates a card's cost is not what it seems. Cards belonging to piles not in the [[Supply]] have asterisks in their costs to remind players that, despite having a cost, they cannot be bought. {{Card|Peddler}} has an asterisk in its cost to remind players it has an effect which changes its cost.
  
Some cards in [[Empires]] include [[Debt]] in their cost, symbolized {{Debt}}. This may be in addition to some number of {{Cost|}}. The {{Cost}} and {{Debt}} components of costs are orthogonal; {{Debt|1}} is not greater than, less than, or equal to {{Cost|1}}. Unlike {{Cost}} and {{P}}, players do not pay {{Debt}} when buying cards costing {{Debt}}; instead they take {{Debt}} tokens when buying cards costing {{Debt}}. {{Debt}} is paid off by {{Cost}}.
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The costs of some cards from [[Guilds]] include a plus sign (e.g., {{Cost|3+}}), which indicates that a card may be [[overpay|overpaid]] for.
  
Some cards in [[Guilds]] include a superscript plus sign in their cost (e.g., {{Cost|3+}}). This indicates the card may be [[overpay|overpaid]] for.
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Asterisk and plus signs are only reminders; a card still has its normal cost for all purposes described below.
  
Some cards include an asterisk in their cost (e.g., {{Cost|0*}}). This indicates there is something unusual about the card's cost. Cards from [[non-Supply]] piles have asterisks in their costs to remind players that, despite having a cost, they cannot be bought. {{Card|Peddler}}, {{card|Destrier}}, {{card|Wayfarer}}, and {{card|Fisherman}} have asterisks to remind players that they have effects that change their cost, and {{card|Animal Fair}} has an asterisk to remind players that there's an alternative way to buy it other than by paying its cost. Cards with asterisks can be found in [[Prosperity]], [[Cornucopia]], [[Dark Ages]], [[Adventures]], [[Nocturne]], [[Menagerie (expansion)|Menagerie]], and {{set|Plunder}}.
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== Other functions of costs ==
 
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Costs can serve other functions in gameplay, outside of their role in buying something. For example, most [[gainer|gainers]] and several [[trashing attack|trashing attacks]] can only gain or trash cards of specified costs; most [[trash-for-benefit]] cards have effects that depend on the cost of the trashed card; a card's cost determines whether it is eligible to serve as the Bane for {{Card|Young Witch}}, be imitated by {{Card|Band of Misfits}}, or be set aside by {{Card|Prince}} or {{Event|Inheritance}}. For this reason, all cards have costs, even those that it is never possible to buy, such as [[Shelter|Shelters]] and [[Prize|Prizes]].
Asterisks and plus signs are only reminders; unless otherwise specified, a card still has its normal cost for all purposes described below.
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== Comparing costs ==
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Many effects cause players to compare the cost of a card to another card, or a fixed value. These commonly include effects from [[gainers]], [[remodeler]]s, and [[trashing attack]]s. An amount of two cost components ({{Cost}} and {{P}}, or {{Cost}} and {{Debt}}) is only larger than another if both cost component amounts are larger, or one is larger and one the same.
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For example:
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* {{Cost|4P}} costs {{Cost|2}} more than {{Cost|2P}}.
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* Any card with {{P}} or {{Debt}} in its cost does not cost up to {{Cost|4}}.
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* Any card with {{P}} or {{Debt}} in its cost does not cost from {{Cost|3}} to {{Cost|6}}.
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* {{Cost|8||8}} costs more than {{Cost|5}}, but {{Debt|8}} does not.
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* {{Debt|4}} is not more than {{Cost|4}}, and {{Cost|4}} is not more than {{Debt|4}}; both have something the other lacks.
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* Things that change costs only change the {{Cost}} cost; {{P}} and {{Debt}} are unaffected by changes in {{Coin}}.
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== Purposes of costs ==
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The primary purpose of a card's cost is to indicate the resources needed to buy it. However, many things make references to a card's cost at other times. For example:
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* Most gainers and several trashing attacks can only gain or trash cards with specified costs.
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* Most [[trash-for-benefit]] cards have effects that depend on the cost of the trashed card.
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* Only cards with certain costs may be {{Card|Young Witch|Young Witch's}} bane.
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* Only cards with certain costs may be commanded by {{Card|Band of Misfits}}, {{Card|Overlord}}, or {{card|Captain}}, or be set aside by {{Card|Prince}}, {{Event|Inheritance}}, {{Event|Summon}}, or {{Way|Way of the Mouse}}.
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* The effect of the card {{card|Chariot Race}} depends on comparing the costs of two other cards.
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For this reason, all cards have costs, even those that it is never possible to buy, such as [[Shelter]]s and [[Heirloom]]s.
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== Changes in cost ==
 
== Changes in cost ==
Some things have effects that temporarily or permanently [[Cost reduction|change the cost]] of some or all cards: {{Card|Bridge}}, {{Card|Bridge Troll}}, {{Project|Canal}}, {{trait|Cheap}}, {{card|Destrier}}, {{ally|Family of Inventors}}, {{Event|Ferry}}, {{card|Fisherman}}, {{Card|Highway}}, {{Card|Inventor}}, {{Card|Peddler}}, {{Card|Princess}}, {{Card|Quarry}} and {{card|Wayfarer}}. When these effects occur, the affected costs are changed for all purposes (see above). These abilities change the costs of cards, but not of Events or Projects.
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Some cards have effects that temporarily [[Cost reduction|reduce the cost]] of some or all cards: {{Card|Bridge}}, {{Card|Quarry}}, {{Card|Peddler}}, {{Card|Highway}}, {{Card|Bridge Troll}}, and {{Card|Princess}}, as well as the Event {{Event|Ferry}}. When these effects occur, costs are changed for all purposes—not only the cost of buying cards is changed, but so are other effects that depend on cost such as those listed above. These abilities change the costs of cards, but not of Events.
  
 
== Strategy ==
 
== Strategy ==
In general, more "powerful" cards, Events and Projects have higher costs, but overall power is not the only consideration that goes into determining cost. For example:
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In general, more "powerful" cards and Events have higher costs, but overall power is not the only consideration that goes into determining cost. {{Card|Chapel}}, for example, is often cited as a card whose power is disproportionate to its low cost of {{Cost|2}}. Costs between {{Cost|2}} and {{Cost|4}} especially are influenced by how useful a card is as an [[opening]], and how desirable or necessary it is to be able to accumulate multiple copies of a card with extra [[+Buy]]. Cards with on-gain or on-buy effects typically cost more than their on-play effect would seem to require.
* {{Card|Chapel}} is often cited as a card whose strength is considered disproportionate to its low cost of {{Cost|2}}.
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* Costs between {{Cost|2}} and {{Cost|4}} are influenced by how useful the card, Event, or Project is as an [[opening]], and how desirable or necessary it is to be able to accumulate multiple copies of a card with extra [[Buy]]s.
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* Cards with beneficial on-gain or on-buy effects typically cost more than their on-play effect would seem to require.
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* Some cards' costs differ from what their power levels might suggest in order to interact better with other cards. {{Card|Rats}} costs {{Cost|4}} to interact favorably with trash-for-benefit cards, while {{Card|Border Village}} costs {{Cost|6}} to give you a wider range of other cards to gain with its when-gain ability.
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* Some strong [[non-Supply]] cards, such as {{card|Wish}} and [[Reward]]s, cost {{Cost|0*}} in order to remind the player that they cannot be bought, and to make them less appealing targets for [[trash-for-benefit]] effects. However, other non-Supply cards, such as [[Loot]] and {{card|Horse}}s, do have costs roughly commensurate with their power level.
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In general, a card will never be [[strictly better]] than a similar card with the same or a higher cost.
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Most [[Kingdom card]]s cost between {{Cost|2}} and {{Cost|6}}. There are only eleven Kingdom piles with cards costing more than {{Cost|6}} and one Kingdom card costing less than {{Cost|2}}. This means most games of Dominion do not have Supply cards costing {{Cost|1}} or {{Cost|7}}. These gaps can influence gameplay in subtle but substantial ways. For examples, {{Card|Upgrade}} can trash {{Card|Copper}} without gaining anything, and cannot trash anything to gain a {{Card|Province}}. In the rare games when cards costing {{Cost|1}} or {{Cost|7}} are in the Supply, the utility of a card like Upgrade can change dramatically.
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=== 0 cost ===
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Cards that cost {{Cost|0}} are either meant to be so terrible that they're essentially free (e.g., {{Card|Copper}}, {{Card|Curse}}, and [[Ruins]]), or are non-Supply cards that are meant to be quite powerful. In the latter case, a zero cost helps indicate that these are not normal cards, and discourages any other use for them than playing them (such as [[Remodeler|remodeling]] them).
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Events that cost {{Cost|0}} are meant to be always available, and come with some penalty or restriction to prevent their abuse.
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Cards and Events that cost {{Cost|0}} still require an available Buy, whether the single Buy available each turn or given by a card such as {{Card|Festival}}, in order to buy them.
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=== 1 cost ===
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Cards that cost {{Cost|1}} do so mainly as a gimmick: {{Card|Poor House}} has this cost for flavor reasons, and to change early game playstyles.
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{{Event|Save}} and {{event|Bury}}, the Events that cost {{Cost|1}}, have a relatively minor effects that are intended to be almost always available.
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=== 2 cost ===
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{{Cost|2}} is the lowest normal cost for Kingdom cards. Cards that cost {{Cost|2}} are priced so players can always open with them, and can easily pick up extra copies of them with spare Buys. These include:
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* Cards whose effects are usually relatively weak or inconsequential (e.g., {{Card|Pearl Diver}} and {{Card|Duchess}}).
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* Cards that are strong only in multiples (e.g., {{Card|Fool's Gold}} and {{Card|Native Village}}). These cards are cheap to enable you to easily buy enough of them to make them worthwhile.
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* Cards that are less strong in multiples (e.g., {{Card|Courtyard}} or {{Card|Hamlet}}). The low price does not make these cards overpowering because, although you can buy several copies of them, they have diminishing returns; you don't get that much benefit from having many copies of them. {{Card|Chapel}} epitomizes this: it's often described as the strongest card in the game relative to its cost, but rarely does anyone need more than one copy of it.
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The {{Cost|2}} Events mostly give +Buy and a small but useful bonus, offering another use for extra {{cost}} the player may have in their Buy phase.
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There are no {{Cost|2}} Projects as it would be too automatic to pick one up with an extra +Buy.
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=== 3 cost ===
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Cards and Events that cost {{Cost|3}} are priced so that players can open with two of them, but cannot (usually) open with one of them and a card costing {{Cost|5}}. They are typically more powerful than {{Cost|2}} cards and Events. Cards, Events and Projects at this cost also directly compete with {{Card|Silver}}.
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=== 4 cost ===
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Cards, Events and Projects that cost {{Cost|4}} are priced so that players can usually open with one of them, but cannot (usually) open with more than one of them. {{Cost|4}} cards are often relatively powerful early-game [[Attack]]s or [[trasher]]s.
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=== 5 cost ===
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{{Cost|5}} is considered to be the most important cost in Dominion, and it is the cost with the most cards, Events and Projects. Most cards at this cost are considered quite powerful; if a player gets to open with a card costing {{Cost|5}}, their other opening card must be {{Cost|2}} or less. The difference in power between a typical card costing {{Cost|5}} and a card costing {{Cost|4}} is substantially wider than between cards costing {{Cost|4}} and cards costing {{Cost|3}}. Therefore, making {{Cost|5}} is an important part of early game strategy; players must often choose between early trashing, or buying things that will help them make {{Cost|5}}. Most [[curser]]s and many powerful [[terminal draw]] cards cost {{Cost|5}}.
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=== 6 cost ===
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Cards, Events and Projects that cost {{Cost|6}} directly compete with {{Card|Gold}}. They tend to be exceptionally powerful, and players usually cannot open with them.
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=== 7 cost ===
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Cards, Events and Projects that cost {{Cost|7}} still compete with Gold, but the extra {{Cost|1}} in cost means these few cards, Events and Projects are just that much harder to acquire. Cards costing {{Cost|7}} can be seen as a consolation prizes for not making {{Cost|8}}, but they also allow [[Trasher#Remodelers|remodelers]] that gain cards costing "exactly {{Cost|1}} more than" a trashed card to gain Provinces.
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=== 8 cost ===
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Cards, Events, and Projects that cost {{Cost|8}} directly compete with {{Card|Province}}; a player chooses to buy these cards, Events or Projects instead of a Province. {{Card|Peddler}}, while nominally costing {{Cost|8}}, is rarely purchased for more than {{Cost|4}}.
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=== 9 and higher cost ===
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{{Card|Platinum}} at {{Cost|9}} and {{Card|Colony}} at {{Cost|11}} have the most expensive {{Cost}} costs of card piles in the game, and {{Event|Dominate}} at {{Cost|14}} is the most expensive Event in the game. The two most expensive [[Castle]]s ({{Card|Grand Castle}} at {{Cost|9}} and {{Card|King's Castle}} at {{Cost|10}}) also fall into this price range, and all the cards and Events in this category can be extremely powerful. Games with these high-costing cards usually last longer as players build their decks up to make enough {{Cost}} to buy them.
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=== Potion cost ===
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Since the only way to buy a card with {{P}} in the cost is the relatively inflexible {{Card|Potion}} card, such cards are generally more inconvenient to acquire than comparable cards with {{Cost}} costs. To motivate players to go to the trouble, these cards are typically powerful and reward accumulating multiple copies of them.
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=== Debt cost ===
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[[Debt]] allows players to pay some or all of a card or Event's cost at a later time. Cards and Events with solely {{Debt}} in their cost can be bought at any time, provided the player does not already have {{Debt}}. Thus, while they may be expensive, they can be bought on a player's opening turns, though this may mean that they can't buy anything else for the next turn or turns. As such, {{Debt}} cards and Events with no other cost tend to have some feature or penalty that makes them not worth buying in the first few turns.
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One card ({{Card|Fortune}}) and one Event ({{Event|Wedding}}) have both a {{Cost}} cost and a {{Debt}} cost; the same concepts from the purely {{Debt}}-costing cards and Events apply, but now these two have an additional {{Cost}} threshold that must be met as well, rather than being able to buy them at any time.
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== Trivia ==
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=== Donald X.'s thoughts ===
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{{Quote|
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|Text=
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You start the game making $3.5 a turn, so {{Cost|2}}-{{Cost|4}}'s are much more a function of 1) openings, 2) utility with +Buys, 3) perception. Well except for early ones where I hadn't worked this out.
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Obv. some cards care about their own cost specifically, e.g. {{Card|Band of Misfits}}, or have a weird cost thing e.g. {{Card|Peddler}}. And all {{Card|Remodel}}s have built in the possibility of {{Card|Remodel}}-ing them. I think those are the main cases - refer to cost of itself, refer to cost of cards in general. Being the bottom of a split pile does have the possibility of making a difference.
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Cards try not to be too similar to other cards, but sometimes something similar seems worthwhile, and then it's an issue, it can't be strictly better than another card. This may cause it to do more/less so it can have a different cost. Or kill it.
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Sometimes there's a good reason for a card to be cheap or a {{Cost|5}} or expensive - a reactive card wants to be cheap, an early-game card prefers to cost less than {{Cost|5}}, a slow (but somehow worthwhile) card wants to cost more. But here the card itself is tweaked to get something that's good at the good cost.
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Most [[Kingdom card|Kingdom cards]] cost between {{Cost|2}} and {{Cost|6}}; there are only six costing more than {{Cost|6}} (as well as two Events) and one costing less than {{Cost|2}} (as well as four Events). This means that, in most games of Dominion, there is a gap in the supply at the costs of {{Cost|1}} and {{Cost|7}}. This gap can influence gameplay in subtle but substantial ways: for instance, it means that {{Card|Upgrade}} can be used to trash {{Card|Copper}} without gaining anything, but cannot be used to gain {{Card|Province}}. In the rare games when {{Cost|1}}- or {{Cost|7}}-cost cards are in the Supply, therefore, the utility of a card like Upgrade can change dramatically.
|Name=[[Donald X. Vaccarino]]
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|Source=[http://forum.dominionstrategy.com/index.php?topic=5799.msg674234#msg674234 Interview with Donald X.]
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}}
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Some statistics on costs (as of November 2018):
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{| class="wikitable"
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! Cost !! Kingdom Card Piles !! Differently-named Cards !! Kingdom Card Piles ([[Second Edition|2E]] only) !! Differently-named Cards ([[Second Edition|2E]] only) !! Events !! Projects !! Non-Kingdom Supply Piles
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|-
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|  || 334 || 405 || 322 || 393 || 34 || 20 || 11
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|-
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| style="text-align:center;" | {{Cost|0}} ||  || 19 (4.7%) ||  || 19 (4.8%) || 4 (11.8%) ||  || 3 ({{Card|Copper}}, {{Card|Curse}}, [[Ruins]])
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|-
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| style="text-align:center;" | {{Cost|1}} || 1 (0.3%) || 4 (1.0%) || 1 (0.3%) || 4 (1.0%) || 1 (2.9%) ||  ||
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|-
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| style="text-align:center;" | {{Cost|2}} || 39 (11.7%) || 45 (11.1%) || 38 (11.8%) || 44 (11.2%) || 4 (11.8%) ||  || 1 ({{Card|Estate}})
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|-
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| style="text-align:center;" | {{Cost|3}} || 58 (17.4%) || 64 (15.8%) || 55 (17.1%) || 61 (15.5%) || 5 (14.7%) || 5 (25.0%) || 1 ({{Card|Silver}})
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|-
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| style="text-align:center;" | {{Cost|4}} || 90 (26.9%) || 99 (24.4%) || 85 (26.4%) || 94 (23.9%) || 4 (11.8%) || 4 (20.0%) || 1 ({{Card|Potion}})
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|-
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| style="text-align:center;" | {{Cost|5}} || 112 (33.5%) || 128 (31.6%) || 110 (34.2%) || 126 (32.1%) || 6 (17.6%) || 6 (30.0%) || 1 ({{Card|Duchy}})
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|-
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| style="text-align:center;" | {{Cost|6}} || 14 (4.2%) || 18 (4.4%) || 13 (4.0%) || 17 (4.3%) || 3 (8.8%) || 3 (15.0%) || 1 ({{Card|Gold}})
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|-
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| style="text-align:center;" | {{Cost|7}} || 4 (1.2%) || 5 (1.2%) || 4 (1.2%) || 5 (1.3%) || 1 (2.9%) || 1 (5.0%) ||
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|-
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| style="text-align:center;" | {{Cost|8}} || 2 (0.6%) || 4 (1.0%) || 2 (0.6%) || 4 (1.0%) || 1 (2.9%) || 1 (5.0%) || 1 ({{Card|Province}})
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|-
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| style="text-align:center;" | {{Cost|9}} ||  || 2 (0.5%) ||  || 2 (0.5%) ||  ||  || 1 ({{Card|Platinum}})
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|-
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| style="text-align:center;" | {{Cost|10}} ||  || 1 (0.2%) ||  || 1 (0.3%) ||  ||  ||
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|-
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| style="text-align:center;" | {{Cost|11}} ||  || 1 (0.2%) ||  || 1 (0.3%) ||  ||  || 1 ({{Card|Colony}})
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|-
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| style="text-align:center;" | {{Cost|14}} ||  ||  ||  ||  || 1 (2.9%) ||  ||
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|-
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| style="text-align:center;" | Includes {{Cost|P}} || 10 (3.0%) || 10 (2.5%) || 10 (3.1%) || 10 (2.5%) ||  ||  ||
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|-
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| style="text-align:center;" | Includes {{Debt}} || 4 (1.2%) || 5 (1.2%) || 4 (1.2%) || 5 (1.3%) || 5 (11.8%) ||  ||
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|}
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