King of the Oathbreakers

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

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.

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

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.

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.

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.