End of Days

This spell is considered countered if any opponent concedes the game before this spell resolves.
When this comes into the battlefield, exile all
non-land permanents and each player exiles their library.
When a player draws from an empty library,
they may sacrifice a permanent instead of losing the game.
At the start of your upkeep, put a time counter on End Of Days.
Lose life equal to the number of time counters on end of days at the end of your next end step.