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

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

This creature gets +1/+1 for each other creature on the battlefield named Relentless Rats. A deck can have any number of cards named Relentless Rats.

Whenever this creature deals combat damage to a player, put a +1/+1 counter on it. {1}{B}: Regenerate this creature.

Swarm of Rats's power is equal to the number of Rats you control.

When this creature enters, target opponent discards a card.

This artifact enters with X gem counters on it. {1}, {T}, Remove a gem counter from this artifact: Target creature can't attack or block this turn.

{T}: Add {C}. {2}, {T}: Each player draws a card, then discards a card.

If a spell or ability an opponent controls causes you to discard a card, you may reveal that card and put it on top of your library instead of putting it anywhere else. {T}: Add {C}.

This land enters tapped. When this land enters, target player loses 1 life. {T}: Add {B}.

{2}, {T}: You gain 5 life. Shuffle this artifact and your graveyard into their owner's library.

Return target creature card from your graveyard to your hand.

Target creature gets -X/-X until end of turn.

Destroy target green or white creature.

{T}, Sacrifice this artifact: Exile target player's graveyard. When this artifact is put into a graveyard from the battlefield, you may pay {B}. If you do, draw a card.

Enchant creature Enchanted creature gets -1/-1 for each Swamp you control.

Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)