Shambleshark
Shambleshark {G}{U}
Creature - Fish Crab | Power/Toughness: 2 / 1
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.)
Latest set: [GTC] Gatecrash (C)