Cheapest priced copy (Commander Legends): $0.35 at Card Kingdom, near mint, their price list as of .
Faith Unbroken 
Enchantment — Aura · Uncommon · Eldritch Moon · #24
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.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
4 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander Legends | 373 | Uncommon | $0.35 | — |
| Eldritch Moon | 24 | Uncommon | $0.35 | $0.49 |
| Innistrad Remastered | 21 | Uncommon | $0.35 | $0.49 |
| The List | EMN-24 | Uncommon | $0.35 | — |
5 rulings from Wizards of the Coast
- 13 July 2016The 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.
- 13 July 2016If a token is exiled, it ceases to exist. It won't be returned to the battlefield.
- 13 July 2016Auras 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.
- 13 July 2016In 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.
- 13 July 2016If Faith Unbroken leaves the battlefield before its triggered ability resolves, the targeted creature won't be exiled.