God Gundam

+1: You gain life equal to the number of creatures you control plus the number of planeswalkers you control.
-2: Create a 2/2 white Gundum Suit creature token Gundam Soldier with "Whenever you gain life, put a +1/+1 counter on Gundam Soldier."
0: If you have at least 15 life more than your starting life total, exile God Gundam and each artifact and creature your opponent