Dralnu, Lich Lord is a rare Legendary Creature — Zombie Wizard card from Time Spiral (TSP), collector number 237. Current market price: $0.29 (foil $5.00), TCGplayer market prices via Scryfall.
If damage would be dealt to Dralnu, sacrifice that many permanents instead. {T}: Target instant or sorcery card in your graveyard gains flashback until end of turn. The flashback cost is equal to its mana cost. (You may cast that card from your graveyard for its flashback cost. Then exile it.)