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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.
'{X}: This creature deals X damage to each creature and each player. Spend only black mana on X.
'Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)
'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.
'Haste At the beginning of the end step, sacrifice this creature. At the beginning of your upkeep, if this card is in your graveyard, you may exile a black creature...
'Fear (This creature can't be blocked except by artifact creatures and/or black creatures.) At the beginning of your upkeep, you may search your library for a Rat card, reveal it,...
'Swarm of Rats's power is equal to the number of Rats you control.
'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.
'Whenever a creature you control enters, if it has one or more oil counters on it, put an oil counter on it. Creatures you control with oil counters on them...
'Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)
'{X}: This creature deals X damage to each creature and each player. Spend only black mana on X.
'Fear (This creature can't be blocked except by artifact creatures and/or black creatures.)