Cast Worldfire by paying ({6} magic symbol) ({R} magic symbol) ({R} magic symbol) ({R} magic symbol) , exiling all permanents, all cards in all hands and graveyards, and setting each player's life total to one.
Parallax Wave leaves the battlefield, returning Kediss and Bloodswarn Steward from exile to the battlefield.
Chasm Guide enters the battlefield, giving creatures you control haste until end of turn.
Deal combat damage to an opponent with Kediss.
The opponent dealt damage loses the game due to having less than zero life.
Kediss triggers, dealing damage equal to the combat damage dealt to each other opponent.
Each other opponent loses the game due to having less than zero life.