Imminent Doom is a rare Enchantment card from Hour of Devastation Promos (PHOU), collector number 98s. Current market price: — (foil $0.55), TCGplayer market prices via Scryfall.
This enchantment enters with a doom counter on it. Whenever you cast a spell with mana value equal to the number of doom counters on this enchantment, this enchantment deals that much damage to any target. Then put a doom counter on this enchantment.