Fluttershy is best pony.
RETURN TO RAVNICA SPOILER - PACK RAT
Pack Rat (Rare) 1B
Creature - Rat
Pack Rat's power and toughness are each equal to the number of Rats you control.
2B, Discard a card: Put a token onto the battlefield that's a copy of Pack Rat.
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Illustration: Kev Walker #74/274