Black Hole

Shroud, Indestructible
At the beginning of each player's upkeep, that
player exiles a non token permanent they control
other than Black Hole face down under Black
Hole. If Black Hole would leave the battlefield,
shuffle each card exiled this way into its owner's
library.
When Black Hole has 100 or more permanents
exiled under it, each player loses the game.