The Dream Lord

When The Dream Lord enters the battlefield, all players separate their libraries into two equal
halves, then play a subgame against themselves
using the halves as decks. They discard
the half that loses the subgame. When either
half would lose, they get to take one more turn. If
both halves lose as a result of this, neither are discarded and that player gains may put a
permanent from their hand onto
the battlefield in the main game.