Huntmaster Liger is a uncommon Creature — Cat card from Ikoria: Lair of Behemoths (IKO), collector number 16. Current market price: $0.24 (foil $0.18), TCGplayer market prices via Scryfall.
Mutate {2}{W} (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.) Whenever this creature mutates, other creatures you control get +X/+X until end of turn, where X is the number of times this creature has mutated.