Placid Rottentail is a common Creature — Fungus Rabbit card from March of the Machine (MOM), collector number 199. Current market price: $0.28 (foil $0.27), TCGplayer market prices via Scryfall.
Vigilance {2}{G}, Exile this card from your graveyard: Put two +1/+1 counters on target creature. Activate only as a sorcery.