Museum Nightwatch is a common Creature — Centaur Soldier card from Murders at Karlov Manor (MKM), collector number 25. Current market price: $0.07 (foil $0.09), TCGplayer market prices via Scryfall.
When this creature dies, create a 2/2 white and blue Detective creature token. Disguise {1}{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.)