Battle Mammoth is a mythic Creature — Elephant card from Kaldheim Promos (PKHM), collector number 160p. Current market price: $1.25 (foil $1.35), TCGplayer market prices via Scryfall.
Trample Whenever a permanent you control becomes the target of a spell or ability an opponent controls, you may draw a card. Foretell {2}{G}{G} (During your turn, you may pay {2} and exile this card from your hand face down. Cast it on a later turn for its foretell cost.)