Akroma, Angel of Fury is a mythic Legendary Creature — Angel card from From the Vault: Angels (V15), collector number 1. Current market price: — (foil $3.16), TCGplayer market prices via Scryfall.
This spell can't be countered. Flying, trample, protection from white and from blue {R}: Akroma gets +1/+0 until end of turn. Morph {3}{R}{R}{R} (You may cast this card face down as a 2/2 creature for {3}. Turn her face up any time for her morph cost.)