Primal Plasma is a common Creature — Elemental Shapeshifter card from Time Spiral Remastered (TSR), collector number 80. Current market price: $0.24 (foil $0.40), TCGplayer market prices via Scryfall.
As this creature enters, it becomes your choice of a 3/3 creature, a 2/2 creature with flying, or a 1/6 creature with defender.