Knight of Dusk's Shadow is a uncommon Creature — Human Knight card from Dominaria United (DMU), collector number 96. Current market price: $0.29 (foil $0.36), TCGplayer market prices via Scryfall.
Menace (This creature can't be blocked except by two or more creatures.) Your opponents can't gain life. {1}{B}: This creature gets +1/+1 until end of turn.