: Tap target creature with power 2 or less.

Whenever Carrion Rats attacks or blocks, any player may exile a card from their graveyard. If a player does, Carrion Rats assigns no combat damage this turn.

: Crypt Rats deals X damage to each creature and each player. Spend only black mana on X.

When Earsplitting Rats enters the battlefield, each player discards a card.

Discard a card: Regenerate Earsplitting Rats.

At the beginning of combat on your turn, if you both own and control Graf Rats and a creature named Midnight Scavengers, exile them, then meld them into Chittering Host.

Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)

When Ichor Rats enters the battlefield, each player gets a poison counter.

Pestilence Rats's power is equal to the number of other Rats on the battlefield. <I>(For example, as long as there are two other Rats on the battlefield, Pestilence Rats's power and toughness are 2/3.)</I>

: Target blocking creature gets -1/-1 until end of turn.

Exile X target cards from a single graveyard.

When Ravenous Rats enters the battlefield, target opponent discards a card.

Relentless Rats gets +1/+1 for each other creature on the battlefield named Relentless Rats.

A deck can have any number of cards named Relentless Rats.

Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)

Whenever Septic Rats attacks, if defending player is poisoned, it gets +1/+1 until end of turn.

Shadow (This creature can block or be blocked by only creatures with shadow.)

Whenever Stronghold Rats deals combat damage to a player, each player discards a card.

When Thriving Rats enters the battlefield, you get (two energy counters).

Whenever Thriving Rats attacks, you may pay . If you do, put a +1/+1 counter on it.

Trample

When Wave of Rats dies, if it dealt combat damage to a player this turn, return it to the battlefield under its owner's control.

Blitz (If you cast this spell for its blitz cost, it gains haste and "When this creature dies, draw a card." Sacrifice it at the beginning of the next end step.)