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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.
'When this creature enters, target opponent discards a card.
'When this creature enters, target opponent discards a card.
'Swarm of Rats's power is equal to the number of Rats you control.
'When this creature enters, target opponent discards a card.
'When this creature enters, target opponent discards a card.
'When this creature enters, target opponent discards a card.
'When this creature enters, target opponent discards a card.
'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.
'Cumulative upkeep {1} (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on...
'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/+1 for each other creature on the battlefield named Relentless Rats.
A deck can have any number of cards named Relentless Rats.