Enemy of Enlightenment is a uncommon Enchantment Creature — Demon card from Theros Beyond Death (THB), collector number 92. Current market price: $0.06 (foil $0.28), TCGplayer market prices via Scryfall.
Flying This creature gets -1/-1 for each card in your opponents' hands. At the beginning of your upkeep, each player discards a card.