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'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.
'This creature enters with a +1/+1 counter on it if you control a permanent with mana value 4 or greater. Whenever you cast a spell with mana value 4 or...
'Plague Rats's power and toughness are each equal to the number of creatures named Plague Rats on the battlefield.
'This creature gets +1/+0 for each other Rat you control.
A deck can have any number of cards named Rat Colony.
'Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)
'Champion an Elf (When this creature enters, sacrifice it unless you exile another Elf you control. When this creature leaves the battlefield, that card returns to the battlefield.) {2}{G}: Create...
'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.
Evolve Your Style with Reuniclus! Would you shake hands with the Multiplying Pokémon? Team up with Reuniclus as a foil promo card that can evolve your entire Bench at once,...
'Trample, haste If you would put one or more counters on a permanent or player, put twice that many of each of those kinds of counters on that permanent or...
'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...
'When Minsc enters, create Boo, a legendary 1/1 red Hamster creature token with trample and haste. {X}: Until end of turn, target creature you control has base power and toughness...
'Flash You may cast noncreature spells as though they had flash. Whenever you cast a noncreature spell, Birds, Frogs, Otters, and Rats you control get +1/+1 until end of turn....