Zygaxis, the End of All Things

Zygaxis, the End of All Things enters the battlefield with 5 apocalypse counters on him.
At the beginning of each opponents upkeep, roll
a 6-sided dice. If the number rolled is equal to
the number of Apocalypse counters on Zygaxis, destroy all permanents your opponents control.
Each opponents life total becomes 1. After the
dice has been rolled three times, remove a
counter from Zygaxis. When there are no
Apocalypse counters on Zygaxis, each
opponent loses the game.