Kytheon, Akroan "Justice"

+1: Until end of turn, Kytheon becomes a 2/2 indestructible human that's still a planeswalker and prevent all damage that would be dealt to him.
-7: Exile up to three creatures. You get an emblem with "While Kytheon, Akroan "Justice" is a creature, he has base power and toughness 6/6 instead."
: Kytheon, Akroan "Justice" can be your commander