Merciless Eternal is a uncommon Creature — Zombie Cleric card from Hour of Devastation (HOU), collector number 71. Current market price: $0.11 (foil $0.42), TCGplayer market prices via Scryfall.
Afflict 2 (Whenever this creature becomes blocked, defending player loses 2 life.) {2}{B}, Discard a card: This creature gets +2/+2 until end of turn.