Gabriel, the Golden Herald

Flying, vigilance, protection from demons
Exile Gabriel, the Golden Herald. Creatures you control gain exalted until the end of the game.
You may cast it from exile for its converted mana
cost at any time.
"I am Gabriel. I stand in the presence of God, and I
was sent to speak to you and to bring you this good
news."
-Gabriel, Archangel of the Lord