Sunfrill Imitator is a rare Creature — Dinosaur card from The Lost Caverns of Ixalan Commander (LCC), collector number 62. Current market price: $3.42, TCGplayer market prices via Scryfall.
Whenever this creature attacks, you may have it become a copy of another target Dinosaur you control, except its name is Sunfrill Imitator and it has this ability.