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'Whenever a Rat you control becomes blocked, it gets +2/+0 until end of turn.
'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.
'Search your library for up to three cards with the same name as target creature, reveal them, put them into your hand, then shuffle.
'Grakmaw enters with three +1/+1 counters on it. Whenever another creature you control dies, if it had a +1/+1 counter on it, put a +1/+1 counter on Grakmaw. When Grakmaw...
Menace
Whenever Rat King or another nontoken creature you control leaves the battlefield, create a 1/1 black Rat creature token.
{2}, Sacrifice a token: Draw a card.
Vigilance
Whenever this creature is dealt damage, you may search your library for up to that many land cards, put them onto the battlefield tapped, then shuffle.
'Flying, lifelink Ward—Sacrifice three nonland permanents. If a card you didn't control would be put into an opponent's graveyard from anywhere, exile it instead. During your turn, you may play...
Not all Ratkin experiments are entirely successful. Many creations perish soon after birth, too utterly broken to survive. Sometimes, happy circumstance means that one of these hideous abominations, forged in...
'When this creature enters, target opponent puts a card from their hand on top of their library.
'Flash Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.) Double strike Other...
'When this creature enters, each player discards a card.
Discard a card: Regenerate this creature.
'Destroy all creatures. You gain life equal to the number of creatures you controlled that were destroyed this way.