Adaptive Snapjaw is a common Creature — Lizard Beast card from Gatecrash (GTC), collector number 113. Current market price: $0.17 (foil $0.34), TCGplayer market prices via Scryfall.
Evolve (Whenever a creature you control enters, if that creature has greater power or toughness than this creature, put a +1/+1 counter on this creature.)