King of the Oathbreakers — ruling 1

If a spell an opponent controls targets multiple Spirits you control, King of the Oathbreakers's triggered ability will trigger once for each of those Spirits.

King of the Oathbreakers — ruling 2

Phased-out permanents are treated as though they don't exist. They can't be the target of spells or abilities, their static abilities have no effect on the game, their triggered abilities can't trigger, they can't attack or block, and so on.

King of the Oathbreakers — ruling 3

A phased-out token will phase in at the beginning of its controller's untap step just like a nontoken permanent would.

King of the Oathbreakers — ruling 4

As a creature is phased out, Auras and Equipment attached to it also phase out at the same time. Those Auras and Equipment will phase in at the same time that creature does, and they'll phase in still attached to that creature.

King of the Oathbreakers — ruling 5

Permanents phase back in during their controller's untap step, immediately before that player untaps their permanents. Creatures that phase in this way are able to attack and pay a cost of {T} during that turn. If a permanent had counters on it when it phased out, it will have those counters when it phases back in.

King of the Oathbreakers — ruling 6

If King of the Oathbreakers phases in at the same time as one or more other Spirits you control, King of the Oathbreakers's last ability will trigger for each of them.

King of the Oathbreakers — ruling 7

An attacking or blocking creature that phases out is removed from combat.

King of the Oathbreakers — ruling 8

Phasing out doesn't cause any "leaves the battlefield" abilities to trigger. Similarly, phasing in won't cause any "enters the battlefield" abilities to trigger.

King of the Oathbreakers : règles, fonctionnement et interactions (MTG)

King of the Oathbreakers 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

Flying Whenever King of the Oathbreakers or another Spirit you control becomes the target of a spell, it phases out. (Treat it and anything attached to it as though they don't exist until your next turn.) Whenever King of the Oathbreakers or another Spirit you control phases in, create a tapped 1/1 white Spirit creature token with flying.

How it works : King of the Oathbreakers

Original English text — Wizards of the Coast / Scryfall

#1June 16, 2023· Wizards of the Coast
If a spell an opponent controls targets multiple Spirits you control, King of the Oathbreakers's triggered ability will trigger once for each of those Spirits.
Card named in this ruling
Spirit
#2June 16, 2023· Wizards of the Coast
Phased-out permanents are treated as though they don't exist. They can't be the target of spells or abilities, their static abilities have no effect on the game, their triggered abilities can't trigger, they can't attack or block, and so on.
No other card is named in this ruling.
#3June 16, 2023· Wizards of the Coast
A phased-out token will phase in at the beginning of its controller's untap step just like a nontoken permanent would.
No other card is named in this ruling.
#4June 16, 2023· Wizards of the Coast
As a creature is phased out, Auras and Equipment attached to it also phase out at the same time. Those Auras and Equipment will phase in at the same time that creature does, and they'll phase in still attached to that creature.
No other card is named in this ruling.
#5June 16, 2023· Wizards of the Coast
Permanents phase back in during their controller's untap step, immediately before that player untaps their permanents. Creatures that phase in this way are able to attack and pay a cost of during that turn. If a permanent had counters on it when it phased out, it will have those counters when it phases back in.
No other card is named in this ruling.
#6June 16, 2023· Wizards of the Coast
If King of the Oathbreakers phases in at the same time as one or more other Spirits you control, King of the Oathbreakers's last ability will trigger for each of them.
Card named in this ruling
Spirit
#7June 16, 2023· Wizards of the Coast
An attacking or blocking creature that phases out is removed from combat.
No other card is named in this ruling.
#8June 16, 2023· Wizards of the Coast
Phasing out doesn't cause any "leaves the battlefield" abilities to trigger. Similarly, phasing in won't cause any "enters the battlefield" abilities to trigger.
No other card is named in this ruling.
#9June 16, 2023· Wizards of the Coast
Any continuous effects with a "for as long as" duration, such as that of Rangers of Ithilien, ignore phased-out objects. If ignoring those objects causes the effect's conditions to no longer be met, the duration will expire.
No other card is named in this ruling.
#10June 16, 2023· Wizards of the Coast
Choices made for permanents as they entered the battlefield are remembered even after they phase in.
No other card is named in this ruling.