Cast Fractured Identity by paying ({3} magic symbol) ({W} magic symbol) ({U} magic symbol) , exiling Nine Lives and causing each opponent to create a token copy of it.
Nine Lives leaves the battlefield, however you cannot lose the game due to Herald of Eternal Dawn.
Cast Cleansing Nova by paying its mana cost, destroying all enchantments and artifacts.
When each opponent's Nine Lives leaves the battlefield, they each trigger, causing each opponent to lose the game.