Shorecrasher Mimic is a common Creature — Shapeshifter card from Eventide (EVE), collector number 159. Current market price: $0.23 (foil $0.45), TCGplayer market prices via Scryfall.
Whenever you cast a spell that's both green and blue, this creature has base power and toughness 5/3 until end of turn and gains trample until end of turn.