Cheapest priced copy (Innistrad Remastered): $1.99 at Card Kingdom, near mint, their price list as of .
Essence Flux 
Instant · Common · Innistrad Remastered · #354
Exile target creature you control, then return that card to the battlefield under its owner's control. If it's a Spirit, put a +1/+1 counter on it.
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
4 printings · $1.99 to $7.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Innistrad Remastered | 64 | Common | $1.99 | $2.49 |
| Innistrad Remastered | 354 | Common | $2.99 | $7.99 |
| Jumpstart | 151 | Uncommon | $1.99 | — |
| Shadows over Innistrad | 61 | Uncommon | $2.49 | $7.99 |
4 rulings from Wizards of the Coast
- 8 April 2016Essence Flux checks whether the creature is a Spirit after it has returned from exile.
- 8 April 2016If a double-faced card is exiled, it will return with its front face up.
- 8 April 2016If a creature token is exiled, it ceases to exist. It won’t be returned to the battlefield.
- 8 April 2016Auras attached to the exiled creature will be put into their owners’ graveyards. Equipment attached to the exiled creature will become unattached and remain on the battlefield. Any counters on the exiled creature will cease to exist.