Akroma, Angel of Fury (SLD 1287)

Legendary Creature — Angel • Mana cost: {5}{R}{R}{R} • Secret Lair Drop • Mythic

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 it face up any time for its morph cost.)

Illustrated by Randy Vargas.