Crypt Ghast is a rare Creature — Spirit card from Secret Lair Drop (SLD), collector number 169. Current market price: $24.05 (foil $51.95), TCGplayer market prices via Scryfall.
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.) Whenever you tap a Swamp for mana, add an additional {B}.