Taurean Mauler is a rare Creature — Shapeshifter card from Morningtide (MOR), collector number 109. Current market price: $2.98 (foil $63.67), TCGplayer market prices via Scryfall.
Changeling (This card is every creature type.) Whenever an opponent casts a spell, you may put a +1/+1 counter on this creature.