Priest of Ashes

At the beginning of your upkeep, you may pay {2}. If you do, up to one target creature card in your graveyard gains unearth until end of turn. The unearth cost is equal to that card's converted mana cost. (Pay mana equal to the creature's converted mana cost: Return the card to the battlefield. The creature gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)