Mistraf, Dictating

+1: Gain control of target nonland permanent with converted mana cost equal to or less than the number of loyalty counters on Mistraf.
-3: You may choose another activated ability among permanents on the battlefield. If you do, this loyalty ability becomes a copy of it.
-8: You may choose any number of mana costs among commanders in play. If you do, any number of them become another mana cost chosen.