: This spell costs {w}{b}{u}{r}{g} less for each time chaos has ensued this game and for each time a player has casted a spell with mana value 5 or higher.

Mersorane can be your commander.

+2: Exile target permanent with an oblivion counter.

-1: Draw a card for each exiled card with an oblivion counter.

-20: Exile all other cards on the battlefield, hands, graveyards except for Mesorane.