Faith Unbroken

Enchant creature you control
When this Aura enters, exile target creature an opponent controls until this Aura leaves the battlefield.
Enchanted creature gets +2/+2.

Innistrad Remastered

The List

Shadows over Innistrad Remastered

Enchant creature you control
When Faith Unbroken enters the battlefield, exile target creature an opponent controls until Faith Unbroken leaves the battlefield.
Enchanted creature gets +2/+2.

Commander Legends

Eldritch Moon

Auras attached to the exiled creature will be put into their owners' graveyards. Any Equipment will become unattached and remain on the battlefield. Any counters on the exiled permanent will cease to exist.

If Faith Unbroken leaves the battlefield before its triggered ability resolves, the targeted creature won't be exiled.

If a token is exiled, it ceases to exist. It won't be returned to the battlefield.

In a multiplayer game, if Faith Unbroken's owner leaves the game, the exiled card will return to the battlefield. Because the one-shot effect that returns the card isn't an ability that goes on the stack, it won't cease to exist along with the leaving player's spells and abilities on the stack.

The exiled card returns to the battlefield immediately after Faith Unbroken leaves the battlefield. Nothing happens between the two events, including state-based actions. However, if the creature Faith Unbroken enchants leaves the battlefield, Faith Unbroken won't leave itself until state-based actions are checked.