Bat- is a uncommon Creature — Bat card from Unsanctioned (UND), collector number 32. Current market price: $0.11, TCGplayer market prices via Scryfall.
Flying At the beginning of each end step, if an opponent lost 3 or more life this turn, Augment {1}{B} ({1}{B}, Reveal this card from your hand: Combine it with target host. Augment only as a sorcery.)