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'Ninjutsu {U}{B} ({U}{B}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.) Ninjutsu abilities you activate cost {1} less...
'As long as there are four or more card types among cards exiled with this creature, it gets +4/+4 and has trample.
{1}: Exile target card from a graveyard.
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.
Clansmen from across the wild lands learn to hunt not long after they learn to walk. While the Ice Kin favour the bow their heritage demands, the clans have a...
'{X}: This creature deals X damage to each creature and each player. Spend only black mana on X.
'When this enchantment enters, create two Treasure tokens. The first spell you cast each turn that mana from a Treasure was spent to cast has cascade. (When you cast the...
'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.
'This creature gets +1/+0 for each other Rat you control.
A deck can have any number of cards named Rat Colony.
'Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)
'When this creature enters, target opponent discards a card.
'Avoidance — Whenever you cast a noncreature spell, exile up to one target nonland permanent you control, then return that card to the battlefield under its owner's control.
'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.