Hixus, Prison Warden — ruling 1

Hixus's ability causes a zone change with a duration, a style of ability that's somewhat reminiscent of older cards like Oblivion Ring. However, unlike Oblivion Ring, cards like Hixus have a single ability that creates two one-shot effects: one that exiles the creature when the ability resolves, and another that returns the exiled card to the battlefield immediately after Hixus leaves the battlefield.

Hixus, Prison Warden — ruling 2

If Hixus leaves the battlefield before its triggered ability resolves, the creature that dealt combat damage to you won't be exiled.

Hixus, Prison Warden — ruling 3

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

Hixus, Prison Warden — ruling 4

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

Hixus, Prison Warden — ruling 5

The exiled cards return to the battlefield immediately after Hixus leaves the battlefield. Nothing happens between the two events, including state-based actions.

Hixus, Prison Warden — ruling 6

In a multiplayer game, if Hixus's owner leaves the game, the exiled cards will return to the battlefield. Because the one-shot effect that returns the cards 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.

Hixus, Prison Warden : règles, fonctionnement et interactions (MTG)

Hixus, Prison Warden is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Flash (You may cast this spell any time you could cast an instant.) Whenever a creature deals combat damage to you, if Hixus entered this turn, exile that creature until Hixus leaves the battlefield. (That creature returns under its owner's control.)

How it works : Hixus, Prison Warden

Original English text — Wizards of the Coast / Scryfall

#1June 22, 2015· Wizards of the Coast
Hixus's ability causes a zone change with a duration, a style of ability that's somewhat reminiscent of older cards like Oblivion Ring. However, unlike Oblivion Ring, cards like Hixus have a single ability that creates two one-shot effects: one that exiles the creature when the ability resolves, and another that returns the exiled card to the battlefield immediately after Hixus leaves the battlefield.
No other card is named in this ruling.
#2June 22, 2015· Wizards of the Coast
If Hixus leaves the battlefield before its triggered ability resolves, the creature that dealt combat damage to you won't be exiled.
No other card is named in this ruling.
#3June 22, 2015· Wizards of the Coast
Auras attached to the exiled creatures will be put into their owners' graveyards. Equipment attached to the exiled creatures will become unattached and remain on the battlefield. Any counters on the exiled creatures will cease to exist.
No other card is named in this ruling.
#4June 22, 2015· Wizards of the Coast
If a creature token is exiled, it ceases to exist. It won't be returned to the battlefield.
No other card is named in this ruling.
#5June 22, 2015· Wizards of the Coast
The exiled cards return to the battlefield immediately after Hixus leaves the battlefield. Nothing happens between the two events, including state-based actions.
No other card is named in this ruling.
#6June 22, 2015· Wizards of the Coast
In a multiplayer game, if Hixus's owner leaves the game, the exiled cards will return to the battlefield. Because the one-shot effect that returns the cards 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.
No other card is named in this ruling.