Firellan, The Redeemer

{u}{b}{r} Discard 2 cards: Counter target spell that targets you or permanents you control.
{4}{b/r}{u/b}{u/r}: Exile Firellan, The Redeemer and return it to the battlefield transformed. Firellan can't lose this ability
"This power I obtained did great damage...that I will use it to undo."