Drain Life is a common Sorcery card from Fifth Edition (5ED), collector number 156. Current market price: $0.37, TCGplayer market prices via Scryfall.
Spend only black mana on X. Drain Life deals X damage to any target. You gain life equal to the damage dealt, but not more life than the player's life total before the damage was dealt, the planeswalker's loyalty before the damage was dealt, or the creature's toughness.