Primal Clay is a rare Artifact Creature — Shapeshifter card from Fifth Edition (5ED), collector number 395. Current market price: $0.47, TCGplayer market prices via Scryfall.
As this creature enters, it becomes your choice of a 3/3 artifact creature, a 2/2 artifact creature with flying, or a 1/6 Wall artifact creature with defender in addition to its other types. (A creature with defender can't attack.)