Soul Enervation is a uncommon Enchantment card from Murders at Karlov Manor (MKM), collector number 302. Current market price: $0.22 (foil $0.29), TCGplayer market prices via Scryfall.
Flash When this enchantment enters, target creature gets -4/-4 until end of turn. Whenever one or more creature cards leave your graveyard, each opponent loses 1 life and you gain 1 life.