Definitely Not a Turtle is a uncommon Creature — Mutant Ninja Turtle card from Teenage Mutant Ninja Turtles Eternal (TMC), collector number 98. Current market price: $0.28, TCGplayer market prices via Scryfall.
When this creature dies, look at the top six cards of your library. You may reveal a land or legendary Turtle card from among them and put it into your hand. Put the rest on the bottom of your library in a random order.