Thanks. I understood that the equip was played as a sorcery but not the whole cleanup step thing. It was my understanding that if you played an until EoT ability end of turn it would actually end EoT next turn. Are there instances where that is true?
You are confusing "At end of turn" with "until end of turn".
"At end of turn" denotes a trigger that triggers at the beginning of the next end of turn step. If a delayed end of turn trigger is set up during the end of turn step (such as with Astral Slide) it will trigger at the beginning of the next end of turn step.
"Until end of turn" denotes the end of a duration of an effect. These effects end in the Cleanup Step.
Normally, players don't get priority in the Cleanup Step, but sometimes they can get priority if something needs to be handled (such as a Madness trigger after discarding down to 7). If players end up getting priority in the Cleanup Step, another cleanup step occurs.
This keeps you from carrying over effects that last for that turn to the next turn and also keeps you from ending a turn with more than 7 cards in hand.