Gideon, Darkness Slayer

+2: Creatures you control get +1/+1 until end of turn and you gain 2 life.
-12: Exile all non-white creatures you don't control, then create a 6/6 white Cat creature token.
: Alliance - When Gideon, Darkness Slayer enters the battlefield, put a loyalty counter on it for each planeswalker you control with Alliance.