Watcher of the Roost is a uncommon Creature — Bird Soldier card from Khans of Tarkir (KTK), collector number 30. Current market price: $0.17 (foil $0.46), TCGplayer market prices via Scryfall.
Flying Morph—Reveal a white card in your hand. (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.) When this creature is turned face up, you gain 2 life.