Azorius Justiciar — ruling 1

If a creature is already attacking or blocking when it’s detained, it won’t be removed from combat. It will continue to attack or block.

Azorius Justiciar — ruling 2

Activated abilities include a colon and are written in the form “[cost]: [effect].” No one can activate any activated abilities, including mana abilities, of a detained permanent.

Azorius Justiciar — ruling 3

The static abilities of a detained permanent still apply. The triggered abilities of a detained permanent can still trigger.

Azorius Justiciar — ruling 4

When a player leaves a multiplayer game, any continuous effects with durations that last until that player’s next turn or until a specific point in that turn will last until that turn would have begun. They neither expire immediately nor last indefinitely.

Azorius Justiciar — ruling 5

If a permanent’s activated ability is on the stack when that permanent is detained, the ability will be unaffected.

Azorius Justiciar — ruling 6

If a noncreature permanent is detained and later turns into a creature, it won’t be able to attack or block.

Azorius Justiciar — ruling 7

The two creatures can be controlled by the same opponent or by different opponents.

Azorius Justiciar : règles, fonctionnement et interactions (MTG)

Azorius Justiciar 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

When this creature enters, detain up to two target creatures your opponents control. (Until your next turn, those creatures can't attack or block and their activated abilities can't be activated.)

How it works : Azorius Justiciar

Original English text — Wizards of the Coast / Scryfall

#1April 15, 2013· Wizards of the Coast
If a creature is already attacking or blocking when it’s detained, it won’t be removed from combat. It will continue to attack or block.
No other card is named in this ruling.
#2April 15, 2013· Wizards of the Coast
Activated abilities include a colon and are written in the form “[cost]: [effect].” No one can activate any activated abilities, including mana abilities, of a detained permanent.
No other card is named in this ruling.
#3April 15, 2013· Wizards of the Coast
The static abilities of a detained permanent still apply. The triggered abilities of a detained permanent can still trigger.
No other card is named in this ruling.
#4April 15, 2013· Wizards of the Coast
When a player leaves a multiplayer game, any continuous effects with durations that last until that player’s next turn or until a specific point in that turn will last until that turn would have begun. They neither expire immediately nor last indefinitely.
No other card is named in this ruling.
#5April 15, 2013· Wizards of the Coast
If a permanent’s activated ability is on the stack when that permanent is detained, the ability will be unaffected.
No other card is named in this ruling.
#6April 15, 2013· Wizards of the Coast
If a noncreature permanent is detained and later turns into a creature, it won’t be able to attack or block.
No other card is named in this ruling.
#7October 1, 2012· Wizards of the Coast
The two creatures can be controlled by the same opponent or by different opponents.
No other card is named in this ruling.