Akroma, Angel of Fury is a mythic Legendary Creature — Angel card from Masters 25 (A25), collector number 119. Current market price: $1.24 (foil $11.00), 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.)