Dreg Mangler is a uncommon Creature — Plant Zombie card from Return to Ravnica Promos (PRTR), collector number 158. Current market price: — (foil $0.30), TCGplayer market prices via Scryfall.
Haste Scavenge {3}{B}{G} ({3}{B}{G}, Exile this card from your graveyard: Put a number of +1/+1 counters equal to this card's power on target creature. Scavenge only as a sorcery.)