Fear of the Dark is a common Enchantment Creature — Nightmare card from Duskmourn: House of Horror (DSK), collector number 98. Current market price: $0.17 (foil $0.29), TCGplayer market prices via Scryfall.
Whenever this creature attacks, if defending player controls no Glimmer creatures, it gains menace and deathtouch until end of turn. (A creature with menace can't be blocked except by two or more creatures.)