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'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.
'Alliance — Whenever another creature you control enters, create a Treasure token if this is the first or second time this ability has resolved this turn. Otherwise, you may pay...
'Colossal Rattlewurm has flash as long as you control a Desert. Trample {1}{G}, Exile this card from your graveyard: Search your library for a Desert card, put it onto the...
'Deathtouch
Whenever you draw a card, you gain 2 life.
Whenever an opponent draws a card, they lose 2 life.
'{B}, Pay 1 life: This creature gets +1/+0 until end of turn. Activate no more than three times each turn.
Start your engines! When this creature enters, target opponent reveals their hand. You choose an instant or sorcery card from it. That player discards that card. Max speed — This...
'Hellbent — As long as you have no cards in hand, this creature gets +1/+0 and has "{B}: Regenerate this creature." (The next time it would be destroyed this turn,...
'Whenever a Rat you control becomes blocked, it gets +2/+0 until end of turn.
'Valiant — Whenever this creature becomes the target of a spell or ability you control for the first time each turn, look at the top five cards of your library....
'{2}{R}{G}: Create a 2/2 green Wolf creature token.
Daybound (If a player casts no spells during their own turn, it becomes night next turn.)
'Shadow (This creature can block or be blocked by only creatures with shadow.)
Whenever this creature deals combat damage to a player, each player discards a card.
'When this creature enters, you get {E}{E} (two energy counters).
Whenever this creature attacks, you may pay {E}{E}. If you do, put a +1/+1 counter on it.