If I phase out a permenant that does not have phasing, will it phase back in during my next untap step or will it remain phased out until otherwise stated (like in a second exile zone)?
The Basic rulebook, read it! A lot of basic questions are answered there!
How to autocard :
Type [c]Black Lotus[/c] to get Black Lotus.
Type [c=Black Lotus]The Overpowered One[/c] to get The Overpowered One.
Standard Answer to all 5E rules questions: "Ask your DM."
502. Untap Step502.1. First, (...) all phased-out permanents that the active player controlled when they phased out phase in...
502. Untap Step
When someone has an imaginary friend, we call it mental sickness. When a bunch of people have the same imaginary friend, we call it a religion.