Avacynian Missionaries // Lunarch Inquisitors — ruling 1

If Lunarch Inquisitors leaves the battlefield before its triggered ability resolves, the target creature won't be exiled.

Avacynian Missionaries // Lunarch Inquisitors — ruling 2

If Lunarch Inquisitors somehow transforms into Avacynian Missionaries, the creature will remain exiled. If Avacynian Missionaries later leaves the battlefield, the creature will return to the battlefield.

Avacynian Missionaries // Lunarch Inquisitors — ruling 3

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.

Avacynian Missionaries // Lunarch Inquisitors — ruling 4

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

Avacynian Missionaries // Lunarch Inquisitors — ruling 5

In a multiplayer game, if Lunarch Inquisitors'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.

Avacynian Missionaries // Lunarch Inquisitors — ruling 6

The Equipment attached to Avacynian Missionaries remains attached after it transforms into Lunarch Inquisitors.

Avacynian Missionaries // Lunarch Inquisitors : règles, fonctionnement et interactions (MTG)

Avacynian Missionaries // Lunarch Inquisitors 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

At the beginning of your end step, if this creature is equipped, transform it. When this creature transforms into Lunarch Inquisitors, you may exile another target creature until this creature leaves the battlefield.

How it works : Avacynian Missionaries // Lunarch Inquisitors

Original English text — Wizards of the Coast / Scryfall

#1April 8, 2016· Wizards of the Coast
If Lunarch Inquisitors leaves the battlefield before its triggered ability resolves, the target creature won't be exiled.
No other card is named in this ruling.
#2April 8, 2016· Wizards of the Coast
If Lunarch Inquisitors somehow transforms into Avacynian Missionaries, the creature will remain exiled. If Avacynian Missionaries later leaves the battlefield, the creature will return to the battlefield.
No other card is named in this ruling.
#3April 8, 2016· Wizards of the Coast
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.
No other card is named in this ruling.
#4April 8, 2016· 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.
#5April 8, 2016· Wizards of the Coast
In a multiplayer game, if Lunarch Inquisitors'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.
No other card is named in this ruling.
#6April 8, 2016· Wizards of the Coast
The Equipment attached to Avacynian Missionaries remains attached after it transforms into Lunarch Inquisitors.
No other card is named in this ruling.