Mir-Aenn, Mystic Master

+2: Gain life equal to the power of target creature you control, double its power until end of turn
-1: Exile target card from your graveyard. Create a 4/4 white-black spirit angel token with vigilance
-12: You get an emblem that has "Whenever an opponent casts a creature spell, you gain life equal to its converted mana cost, that player loses that much life"