Defenestrated Phantom is a common Creature — Spirit card from Murders at Karlov Manor (MKM), collector number 11. Current market price: $0.03 (foil $0.03), TCGplayer market prices via Scryfall.
Flying Disguise {4}{W} (You may cast this card face down for {3} as a 2/2 creature with ward {2}. Turn it face up any time for its disguise cost.)