Hellspark Elemental is a uncommon Creature — Elemental card from The List (PLST), collector number DDK-46. Current market price: $0.12, TCGplayer market prices via Scryfall.
Trample, haste At the beginning of the end step, sacrifice this creature. Unearth {1}{R} ({1}{R}: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)