World Destroyer

When World Destroyer enters the battlefield,
place a four-sided die on him starting at four. At
the beginning of your next upkeep, lower the die
count by one. Once it hits zero, destroy target
player. If there are more players, then restart the countdown.
"It leaves crumbling worlds and civilizations in its
wake. What are is origins, you ask? Why does it
matter, because when it shows up at your world,
you'll be dead anyways."