Generously donated by a fan of most everything, here is a replica of the special edition card that Wizards of the Coast made for this issue in the original collection!
Maretropolis Penitentiary 2WB
Enchantment
If a creature would die, exile it instead.
Pay the mana cost of a card exiled with Maretropolis Penitentiary: Return that card to the battlefield under your control. Any player may activate this ability, but only whenever that player could cast a sorcery.
When Maretropolis Penitentiary leaves the battlefield, return each card exiled with it to the battlefield under its owner's control.