Shambleshark

Shambleshark

Creature - Shark Crab | Power/Toughness: 2 / 1 (CMC 2)
Flash (You may cast this spell any time you could cast an instant.)
Evolve (Whenever a creature enters the battlefield under your control, if that creature has greater power or toughness than this creature, put a +1/+1 counter on this creature.)