Basilica Screecher is a common Creature — Bat card from Gatecrash (GTC), collector number 58. Current market price: $0.21 (foil $3.97), TCGplayer market prices via Scryfall.
Flying Extort (Whenever you cast a spell, you may pay {W/B}. If you do, each opponent loses 1 life and you gain that much life.)