Terastodon is a rare Creature — Elephant card from Worldwake (WWK), collector number 115. Current market price: $0.47 (foil $3.68), 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.