Terastodon is a rare Creature — Elephant card from Double Masters (2XM), collector number 182. Current market price: $0.35 (foil $0.54), 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.