Soulcoil Viper is a uncommon Creature — Snake card from The Lost Caverns of Ixalan (LCI), collector number 120. Current market price: $0.23 (foil $0.21), TCGplayer market prices via Scryfall.
{B}, {T}, Sacrifice this creature: Return target creature card from your graveyard to the battlefield with a finality counter on it. Activate only as a sorcery. (If a creature with a finality counter on it would die, exile it instead.)