Essence Flux checks whether the creature is a Spirit after it has returned from exile.
2016-04-08 • wotc
Auras 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.
2016-04-08 • wotc
If a creature token is exiled, it ceases to exist. It won’t be returned to the battlefield.
2016-04-08 • wotc
If a double-faced card is exiled, it will return with its front face up.