Touch the Spirit Realm

When this enchantment enters, exile up to one target artifact or creature until this enchantment leaves the battlefield.
Channel — {1}{W}, Discard this card: Exile target artifact or creature. Return it to the battlefield under its owner's control at the beginning of the next end step.

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Auras attached to the exiled permanent 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. When the card returns to the battlefield, it will be a new object with no connection to the card that was exiled.

Discarding the card is part of the cost to activate a channel ability.

If Touch the Spirit Realm leaves the battlefield before its first ability resolves, the target permanent won't be exiled.

If a channel ability requires a target, you may not activate it without a target just to discard the card.

If a double-faced card is exiled and returned to the battlefield with Touch the Spirit Realm or its channel ability, that card will return to the battlefield front-face up.

If a token is exiled this way, it will cease to exist and won't return to the battlefield.