The exiled card returns to the battlefield immediately after Isolation Zone leaves the battlefield. Nothing happens between the two events, including state-based actions.
In a multiplayer game, if Isolation Zoneâ€™s owner leaves the game, the exiled card will return to the battlefield. Because the one-shot effect that returns the card isnâ€™t an ability that goes on the stack, it wonâ€™t cease to exist along with the leaving playerâ€™s spells and abilities on the stack.
If Isolation Zone leaves the battlefield before its triggered ability resolves, the target creature or enchantment wonâ€™t be exiled.
If a token is exiled, it ceases to exist. It wonâ€™t be returned to the battlefield.
Auras attached to the exiled creature or enchantment will be put into their ownersâ€™ graveyards. Any Equipment will become unattached and remain on the battlefield. Any counters on the exiled permanent will cease to exist.
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