Witness The End

You can't cast Witness The End during your first
five turns of the game.
At the beginning of each player's pre-combat mainphase, that player exiles a card from his or
her hand or graveyard. If they can't, they exile a permanent they control. If that player can't, he
or she loses the game.
Whenever a player loses the game, create a nonlegendary token copy of Witness The End.