Hellspark Elemental (DDK-046) - Duel Decks: Sorin vs. Tibalt

Trample, haste
At the beginning of the end step, sacrifice this creature.
Unearth (: 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.)