Mystic of the Hidden Way is a common Creature — Human Monk card from Khans of Tarkir (KTK), collector number 48. Current market price: $0.15 (foil $0.44), TCGplayer market prices via Scryfall.
This creature can't be blocked. Morph {2}{U} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)