The Start Of The Collision

At the beginning of your upkeep, exile a permanent each player controls, at random, under The Start Of The Collision.
When you have 15 or more cards exiled under The Start Of The Collision, sacrifice them, and search your library, hand, graveyard and exile for The Collision, put it onto the battlefield and sacrifice The Start Of The Collision.
"It has started. At the end, there will be nothing left of reality."