Calcite Snapper is a common Creature — Turtle card from Worldwake (WWK), collector number 25. Current market price: $0.07 (foil $0.43), TCGplayer market prices via Scryfall.
Shroud (This creature can't be the target of spells or abilities.) Landfall — Whenever a land you control enters, you may switch this creature's power and toughness until end of turn.