Here's what I've got so far:
https://deckbox.org/sets/1701081

Any good cycling cards that I am missing?
Too far fetched of an idea?
Cards in standard that return target instant/sorcery to hand? Or can copy target instant/sorcery? Besides Torrential Gearhulk?

Censor and Cast Out are the first that come to mind. These are actually really good cards in the format and in general. I noticed you're only running white for Approach of the Second Sun... So maybe you can slide in the cast out? Maybe it will be a bit too heavy for mana. But what I could see happen is dropping red for white entirely, that allows you to run Renewed Faith too.