Terastodon is a rare Creature — Elephant card from 30th Anniversary Play Promos (P30A), collector number 18. Current market price: — (foil $0.37), TCGplayer market prices via Scryfall.
When this creature enters, you may destroy up to three target noncreature permanents. For each permanent put into a graveyard this way, its controller creates a 3/3 green Elephant creature token.