Mystic of the Hidden Way is a common Creature — Human Monk card from Masters 25 (A25), collector number 67. Current market price: $0.05 (foil $0.15), 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.)