Pocket Dimension

Each creature that is exiled to Pocket Dimension
gains one -1/-1 counter at the start of your
upkeep. That creature is destroyed when their toughness reaches 0.
Opponent may pay {2} life to return an exiled
creature to the battlefield.
When SCP-106, The Old Man is destroyed,
destroy Pocket Dimension and return all exiled creatures to the battlefield under their owners
control.