Who won?
Simplified situation from a game tonight and wanting to double check who won.
Four players playing EDH, lots of creatures out, [[Repercussion]] is in play, relevant creatures are [[Platinum Angel]] and [[Agent of Treachery]]. Player 1 casts Platinum Angel and swings out with enough damage to kill everyone but would die from Repercussion if not for the angel. Player 4 copies Agent of Treachery and steals the Angel. Damage from combat and Repercussion is enough to put all players below zero. Who wins?