Mercy, Eternal Valkyrie

+2: Target creature gains flying and lifelink until end of turn.
-5: Return up to one creature card from your graveyard with converted mana cost 3 or less to the battlefield.
-11: Mercy, Eternal Valkyrie becomes a 6/6 white Angel creature token with haste, flying, and lifelink until end of turn. It's still a planeswalker.