Cast Fractured Identity by paying ({3} magic symbol) ({W} magic symbol) ({U} magic symbol) , exiling Lich's Mastery and causing each opponent to create a token copy of Lich's Mastery.
Lich's Mastery leaves the battlefield, triggering its ability.
Holding priority, cast Tempest of Light by paying ({2} magic symbol) ({W} magic symbol) , destroying all enchantments.
Each opponent's Lich's Mastery triggers, causing them to lose the game.