Unable to Scream is a common Enchantment — Aura card from Duskmourn: House of Horror (DSK), collector number 78. Current market price: $0.28 (foil $0.31), TCGplayer market prices via Scryfall.
Enchant creature Enchanted creature loses all abilities and is a Toy artifact creature with base power and toughness 0/2 in addition to its other types. As long as enchanted creature is face down, it can't be turned face up.