Basement Hallway

Your graveyard is considered to be in play and your battlefield is considered to be out of play.
All instant and sorcery cards in your graveyard go onto the stack.
Instant and sorcery cards are exiled after they resolve.
An additional cost to roll the planar dice is to exile a permanent on your battlefield.
Whenever you roll chaos, each opponent mills 5 cards, then you mill cards equal to the number of cards milled this way.