13 Oct 2023
Abilities that trigger when a creature becomes tapped won't trigger when a creature phases in tapped. (This might happen if the creature in question has one or more stun counters on it.)
13 Oct 2023
Any one-shot effects that are waiting "until [this] leaves the battlefield," won't happen when a permanent phases out.
13 Oct 2023
Choices made for permanents as they entered the battlefield are remembered when they phase in.
13 Oct 2023
Any continuous effects with a "for as long as" duration ignore phased-out objects. Any such effects will expire if their conditions are no longer met after ignoring the phased-out objects.
13 Oct 2023
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.
13 Oct 2023
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.
13 Oct 2023
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.