Gain a Rats. Trash a card from your hand other than a Rats (or reveal a hand of all Rats).
When you trash this, +1 Card.
Rats is an Action card from Dark Ages. It is a cantrip that trashes any card and replaces it with another copy of Rats. Thematically, the rats multiply and eat all your resources; if you don't keep them in check, they'll quickly eat your whole deck!
 Official FAQ
- Follow the instructions in order. First draw a card; then gain a Rats from the Supply, putting it into your discard pile; then trash a card from your hand that is not a Rats card.
- If there are no Rats cards left, you do not gain one.
- If you have no cards in your hand other than Rats, reveal your hand and you do not trash a card.
- If Rats is trashed, you draw a card. This happens whether it is your turn or another player's, and regardless of which player has the card that trashed Rats.
- There are 20 copies of Rats, rather than the usual 10; the pile starts with all 20, regardless of the number of players.
 Other Rules clarifications
 Strategy Article
original article by werothegreat, edited by theory
Rats! When we saw this card for the first time we all thought: “Wow, that’s thematic! Why would I ever buy that?”
Rats, like most Dark Ages cards, require more finesse and thought than we’re used to dealing with in Dominion. In most other expansions, the thought goes into which cards to gain at what time. Once they’re in your hand, it’s a pretty simple decision in what order to play your cards (+Actions, +Cards, everything else), unless you have clashing Terminals or are controlling your reshuffles. But cards like Fortress, Death Cart, Junk Dealer and Rats all make you think: “Do I really want to play this now?” And that’s good, right?
 The Point
So what is the point of Rats? Contrary to popular belief, it’s not just to be Donald X’s favorite card. There are several instances where you really want Rats. So what are they? Well, first we need to establish what Rats does.
Rats replaces cards in your deck with Rats. More generally, Rats replaces cards (typically of a low cost) withAction cards (which you don’t want to use too much). The point of Rats is to replace low-cost junk with higher-cost junk. Very quickly, I might add. If you buy one Rats in the first two turns, and use a Rats every time you see it, you should see a hand of five Rats within 10 turns. Obviously, you want to stop before you get to this point.
So Rats trashes junk to give you other junk to feed to a Trash for benefit card (“TfB” hereafter).
“Well, why didn’t I just buy the TfB card in the first place?”
Well, it depends on what kind of TfB we’re talking about. TfB cards that don’t care about cost don’t benefit very much from Rats. These would be cards like Moneylender, Spice Merchant, Jack of all Trades, and Altar. These either can’t trash Rats in the first place, or derive minimal benefit from doing so.
But we have TfB cards that DO care about cost, and here Rats shines.
 What Rats is best with
 The Big Three
The top three that should come to mind are Salvager, Apprentice and Bishop. All three of these convert the cost of a card into some resource – , Cards and , respectively. All of these cards are rather bad at getting rid of your starting Coppers and Estates, and are even worse with Shelters, though Bishop would be the best of these three, since it actually gives a resource when trashing a cost card. So why not trash this card instead? That way, instead of + , +0 Cards or + /+1 , you’ll get + /+1 Card, +5 Cards or + /+3 /+1 Card. That’s a lot better.
 Remodel-style cards
Even cards like Remodel and Remake benefit. Do you want to trash two Coppers and get nothing, or trash two Rats and get two cards? Rats turn Upgrade into a less limited Laboratory/University mashup. Since all of these cards are better when used on higher cost cards, they all do better with Rats. Even lowly Develop, oft derided as slow and cumbersome, gets a boost. Rather than getting nothing for those Coppers you trash one at a time, get a and a card right on top of your deck, after drawing a card!
 Other synergistic trashers
Junk Dealer does well with Rats. Not as well as the Big Three, given that Rats and Junk Dealer fill similar roles. But getting a +1 Card along with the rest of Junk Dealer is a pretty nice addition. Forge might have you thinking to turn two Rats into a Province, which is a cute trick, but if you’re ready to green anyway, that might be better spent on a Gold. Also, that whole trick becomes much harder to pull off with Colonies. Perhaps the greatest combo here is with Death Cart – turn all those Coppers and Estates/Shelters into Actions you’re absolutely glad to get rid of every time.
We have three Reactions so far that deal with trashing and/or gaining, and all of them work well with Rats. If you have a Watchtower in hand, you can trash the Rats you gain when you play a Rats, and get +1 Card to boot. So you’re cleaning up your deck, and depleting a pile. With Market Square in hand, you can lessen the damage of having to trash a non-junk card to a poor Rats play by gaining a Gold. Even if you’re trashing junk, gaining the Gold is awesome. Finally we have Trader. Now, why didn’t I include it in the Big Three? It’s the other trasher that cares about card cost. But the Action for Trader is really more of a facilitator for Big Money, and if that’s what you’re going for, you shouldn’t really be getting Rats in the first place. However, turning a Rats into four Silvers can be a nice supplement to whatever engine you have going on. The Reaction is also nice, replacing your junk with Silver instead of Rats, though this undermines the whole purpose of Rats, at least with regards to the Big Three or Death Cart – again, this would be a supplement.
 Non-trashing options
Which expansion heavily emphasizes Actions? Alchemy, that’s who! And Alchemy has two cards that go well with a card that fills your deck full of junk Actions. First is Vineyard. Turn all those Coppers and Estates into Rats, and now all those Vineyards are worth at least 3 points more! Just don’t trash any Vineyards with them. That would just hurt. Second is Scrying Pool. Scrying Pool works best if you can get rid of your Estates and Coppers and go for a money-less deck. Rats can do just that. Once you’ve Rats’d away all those starting cards, your Scrying Pools should draw your entire deck, except when snagging on Potions. It is therefore no accident that one of the Dark Ages/Alchemy recommended sets (“Infestation”) includes Rats.
Another interesting strategy might be to use Rats to clear out your Coppers for use with Venture or Adventurer. The biggest weakness of these two cards is drawing Copper instead of your better Treasures. If those Coppers are Rats instead, they’ll be skipped. Likewise, Poor House in practice can only work if you trash all your Coppers, so you can use Rats to quickly de-Copper yourself into a monster Poor House engine (ideally involving Council Room and/or King's Court).
 Piling Out
This section is written by jomini
Another tactical component to Rats is the opportunity they give to autopile out.
If you have 2 Rats and an empty discard/draw deck (or 1 Rat in hand and 1 Rat in discard), you can autopile the Rats pile. Play a Rats, draw a Rats, gain a Rats ... lather, rinse, repeat. So if two piles are already gone, you can bang out the Rats for a surprise ending.
But doesn’t that eat all your VP? Not necessarily. Rats can only chew on cards that are in hand, deck or discard. This means that anything elsewhere is immune to Rats. For instance, cards on Islands are safe from being overrun by Rats. Likewise, cards that have been saved with Haven or Native Village are also safe from the Rats onslaught. Another fun shot are dual-type cards already in play. Got all of your Nobles or Great Halls into the play area? Great, Rats can’t touch them this turn. Played out your Harems with a Black Market? Great, rats can’t eat them. Additionally, any VP bought in your final buy phase are safe. A final protective measure is Fortress, just keep using the Rats on the Fortress (which returns to hand afterwards) and keep churning the rats, this can allow you to have a full hand of green, and still autopile on Rats.
So if you can protect VP out of deck/hand/discard, you need to be very careful about emptying two piles. Your great Bridge engine may well lose if the opponent can get two Rats going and win with 5 nobles after you’ve emptied the Nobles and Village piles. You’ve depleted the Island and Fishing Village Pile, great, but now he can autopile with Rats any time he has more points on his Islands than you have in your deck (even if you are about to start hitting triple Colony turns).
Likewise, with VP token setups, you need to be careful as two Rats can allow for autopiling whenever the one guy can win. For instance, let’s say we are mirroring on Goons and building up to engines (say Council Room/King's Court), we empty a pile and I then buy two Rats and end my turn. Now you face a problem – you can cash out your Goons engine by buying scads of copper or you can keep building. If you cash out, I just keep building (more Goons, more buys, whatever) and cash out later for the win (you will have real trouble lining up all your Goons if over half your deck is Copper). If you don’t cash out, then I play all my action cards, then auto-play through the Rats pile, and buy out the Estates (Curses or whatever) and spam buy Coppers. Unless you had a huge lead (very hard to come by in a Goons mirror), you just lost. Even if you buy two Rats now, I can still cash out and then Rats autopile for the win.
Without a Goons engine, it becomes harder to generate the action-cash/buys needed to empty pile two (the third being Rats), but the concept is the same, have two Rats in hand and an empty draw deck/discard and you can force game end if you are winning and two other piles are empty.
Any time you have a lean deck and two piles are going to empty before you start buying big VP can make Rats a surprise game ending move. Island, Fishing Village, Minion, City, Curse givers in big draw engines, etc. can allow for a two Rats autopile to end the game and let you win 6 – 3 or better. This, of course, is stronger if you have card gainers built into your strategy that can add the Rats on the fly. For instance, say you are playing University/City/Familiar. The curses will pile quickly and the Cities may go before you buy any provinces. If you have three Unis and two Familiars you may well be able to pile Cities, Curses, and then gain two Rats to drain all 3 piles in one turn. Buy a Duchy in your buy phase and win by a point or so.
 Rats as a Defense
If all your junk is Rats, certain Attacks suddenly become less painful. Fortune Teller and Rabble clear out all those Rats from your next hand. Saboteur and Knights are suddenly both improving your deck and increasing your next hand. But Rats can also be used to mitigate Curses. Even as the only trasher, it’s better to have a Rats in your deck than a Curse. Sea Hag is most vulnerable to this, given that you’ll know that the next card you draw with Rats will be one you want to trash.
However, do not use Rats to clean up after Looters. Unless you have a Big Three, it would be much better to have a Ruins (which gives a marginal beneficial effect) than a Rats. Ruins do not affect your score, unlike Curses, so don’t feel the need to get Rats if they’re the only trasher.
Also, what hand would you most want Possessed? A hand of five Rats! Then your Possessor can’t do anything without giving himself Rats, and you’ll (hopefully) have a better hand for your turn.
If you’re going to use Masquerade with Rats, remember to only send a Rats to your opponent if he did not play the Masquerade; otherwise, he’s just going to trash it and draw a card.
 When not to buy Rats
What if there are only straight trashers on the board, like Chapel? In that case, you should probably just go with Chapel. Chapelling Rats would draw you some cards, but it would be faster to just Chapel everything away, and spend your on something that will build your economy.
The one TfB card that cares about cost that you DON’T want to use on Rats would be Procession. Sure, you get a cost card, but you also get two Rats, and have to trash two cards in your hand, which, by the time you get both a Rats and a Procession, you may not want to do.
Rats/Ambassador defeats the whole purpose of Rats. Consider Ambassador to be a straight trasher, like Chapel (in a loose sense). If you’re going for that, you don’t want Rats anyway. If your jig is to buy junk to send to your opponent, Curses are much cheaper and will hurt him much more.
What if there are no other trashers on the board, outside of the options listed above? DON’T BUY RATS. Let me repeat that. DO NOT BUY RATS IF THEY ARE THE ONLY TRASHER (outside of the aforementioned cases).
 So I’ve bought Rats, specifically to trash it. When do I?
Buy the Rats within the first two turns, and use a Rats every time it’s in your hand with stuff you want to trash. At the first opportunity, buy your TfB card. Every time it’s in a hand with a Rats, use it on the Rats. Once you have your TfB card, only use Rats if it’s in a hand without that TfB card, and with remaining junk. In the highly unlikely event that you trash your last Rats before all of your junk is gone, don’t worry. You’re leaps and bounds in the right direction anyway. You should only ever purchase one Rats. All your other Rats come from playing a Rats.
 What about those non-trashing cases?
Use Rats whenever you have junk to trash. Be smart with the Rats. If you don’t have anything you want to trash to them in hand, don’t play them. It’s highly unlikely that the next card you draw will be one you want to trash (unless you’ve Spied ahead earlier), so just regard it as junk for that turn and ignore it. Remember: you don’t have to play a card in your hand.
P.S. The Rats pile has 20 cards in it. Don’t forget that.
- Best with:
- Also with:
- Boards without trashers
- Better trashers (Chapel, Steward)
- Treasure-trashers (Moneylender, Spice Merchant, Counterfeit)
 Alternate versions
Digital version for Dominion Online
 In other languages
- Dutch: Ratten
- Finnish: Rotta (Note: singular)
- French: Rats
- German: Ratten
- Japanese: ネズミ (pron. nezumi)
- Korean: 쥐떼 (pron. jwitte)
- Polish: Szczury (note: as referred to in Polish Empires rulebook)
- Russian: Крысы (pron. krysy)
- Spanish: Ratas
 Secret Historyand was crazy. When I thought of making an action that gave you copies of itself, I brought it back as the action. Of course it can't trash copies of itself, because then it would be crazy again. There were a few versions of this that tried different ways to balance the card, and to address the issue of, what if I just buy one Rats when they're all but sold out, to get a good trasher with no penalty. Some versions had a penalty if you couldn't gain a Rats. In the end the key was making Rats a 20-card pile, and giving you a bonus for trashing it.