A creature phased out by Unyaro doesn’t phase in during its controller’s untap step as normal.

While a permanent is phased out, it’s treated as though it doesn't exist. It can’t be the target of spells or abilities, its static abilities have no effect on the game, its triggered abilities can’t trigger, it can’t attack or block, and so on.

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.

Any one-shot effects that are waiting “until [this] leaves the battlefield,” such as that of Banisher Priest, won’t happen when a permanent phases out.

Any continuous effects with a “for as long as” duration, such as that of Tide Shaper, ignore phased-out objects. Any such effects will expire if their conditions are no longer met after ignoring the phased-out objects.

Each Aura and Equipment attached to a permanent that’s phasing out also phases out. They will phase in with that permanent and still be attached to it. Similarly, permanents that phase out with counters phase in with those counters.

Choices made for permanents as they entered the battlefield are remembered when they phase in.

Unyaro : règles, fonctionnement et interactions (MTG)

Unyaro 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 you planeswalked to Unyaro this turn, untap all creatures. They phase out until a player planeswalks. (Treat them and anything attached to them as though they didn't exist.) Whenever chaos ensues, create two 2/2 white and blue Knight creature tokens with vigilance.

How it works : Unyaro

Original English text — Wizards of the Coast / Scryfall

#1April 14, 2023· Wizards of the Coast
A creature phased out by Unyaro doesn’t phase in during its controller’s untap step as normal.
No other card is named in this ruling.
#2April 14, 2023· Wizards of the Coast
While a permanent is phased out, it’s treated as though it doesn't exist. It can’t be the target of spells or abilities, its static abilities have no effect on the game, its triggered abilities can’t trigger, it can’t attack or block, and so on.
No other card is named in this ruling.
#3April 14, 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.
#4April 14, 2023· Wizards of the Coast
Any one-shot effects that are waiting “until [this] leaves the battlefield,” such as that of Banisher Priest, won’t happen when a permanent phases out.
No other card is named in this ruling.
#5April 14, 2023· Wizards of the Coast
Any continuous effects with a “for as long as” duration, such as that of Tide Shaper, ignore phased-out objects. Any such effects will expire if their conditions are no longer met after ignoring the phased-out objects.
No other card is named in this ruling.
#6April 14, 2023· Wizards of the Coast
Each Aura and Equipment attached to a permanent that’s phasing out also phases out. They will phase in with that permanent and still be attached to it. Similarly, permanents that phase out with counters phase in with those counters.
No other card is named in this ruling.
#7April 14, 2023· Wizards of the Coast
Choices made for permanents as they entered the battlefield are remembered when they phase in.
No other card is named in this ruling.