Defiant Greatmaw is a uncommon Creature — Hippo card from Amonkhet (AKH), collector number 163. Current market price: $0.17 (foil $0.47), TCGplayer market prices via Scryfall.
When this creature enters, put two -1/-1 counters on target creature you control. Whenever you put one or more -1/-1 counters on this creature, remove a -1/-1 counter from another target creature you control.