Gemrazer is a rare Creature — Beast card from Ikoria: Lair of Behemoths Promos (PIKO), collector number 155p. Current market price: $0.69 (foil $0.76), TCGplayer market prices via Scryfall.
Mutate {1}{G}{G} (If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.) Reach, trample Whenever this creature mutates, destroy target artifact or enchantment an opponent controls.