Cost reduction

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Bridge, a cost-reducing card.

Cost reduction is a recurring mechanic in Dominion. Rather than directly fielding coin, cost-reducers decrease the cost of cards, an effect which becomes more valuable with more buys. Typical cost reduction instructions follow this wording:

[All cards or some subset of cards] (including cards in players' hands) cost Coinx.png less this turn, but not less than Coin0.png.

Reducing a cost in Coin.png does not reduce a cost in Debt.png or Potion.png.

[edit] List of cost-reducers

[edit] Strategy

Most cards that reference a specific cost in Coin.png do well with cost-reducers, as most such cards use the specific cost as an upper limit. For example, WorkshopWorkshop.jpg can gain any card costing up to Coin4.png; without cost reduction, this effect is rather weak, but with four Highways in play, a Workshop can gain Provinces. On the other hand, cards that give a scaling effect per cost in Coin.png of another card (most often trash for benefit cards) will do less well with cost-reducers, as their effect will be diminished, and cards that reference a cheaper card will give no effect if their cost has been reduced to Coin0.png. For examples, trashing a SilverSilver.jpg to an ApprenticeApprentice.jpg when you have Princess in play will only draw you one card, and with five Highways in play, Band of MisfitsBand of Misfits.jpg can't do anything.

Since cost reduction affects cards but not Events, it is less useful for strategies that depend heavily on buying Events.

Dominion Game Mechanics
Turn Phases ActionBuyClean-up
Vanilla Bonuses +Card • +Action+Buy • +Coin
Tokens AdventuresCoinDebtVictory
Other mechanics CallCost reductionDiscardExchangeGainOverpayPassPayResolveRevealSet asideTrash
Attacks CurserDeck inspection attackDeck order attackHandsize attackJunking attackTrashing attackTurn-worsening attack
Buy/Money +BuyCost-reducerDisappearing moneyOverpayPeddler variantTerminal silverVirtual coinVirtual +Buy
Cycling Deck discarderDeck inspectorDiggingDiscard for benefitSifter
Terminality CantripNon-terminalNon-terminal drawSoft terminalTerminalTerminal drawThrone Room variantVillage
Other Alt-VPBasic cardsGainerLuck-basedNon-Attack interactionOne-shotSplit pileTop deckerTrasherVanilla
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