Lightning Reaver is a rare Creature — Zombie Beast card from Alara Reborn (ARB), collector number 42. Current market price: $0.57 (foil $2.62), TCGplayer market prices via Scryfall.
Haste; fear (This creature can't be blocked except by artifact creatures and/or black creatures.) Whenever this creature deals combat damage to a player, put a charge counter on it. At the beginning of your end step, this creature deals damage equal to the number of charge counters on it to each opponent.