Cursed Wombat is a uncommon Creature — Nightmare Wombat card from Modern Horizons 3 (MH3), collector number 181. Current market price: $0.23 (foil $0.33), TCGplayer market prices via Scryfall.
{2}{B}{G}: Adapt 2. (If this creature has no +1/+1 counters on it, put two +1/+1 counters on it.) Permanents you control have "Whenever one or more +1/+1 counters are put on this permanent, put an additional +1/+1 counter on it. This ability triggers only once each turn."