Wildfire Eternal is a rare Creature — Zombie Jackal Cleric card from Hour of Devastation Promos (PHOU), collector number 109s. Current market price: — (foil $1.34), TCGplayer market prices via Scryfall.
Afflict 4 (Whenever this creature becomes blocked, defending player loses 4 life.) Whenever this creature attacks and isn't blocked, you may cast an instant or sorcery spell from your hand without paying its mana cost.