not sure if this would be better or not just throwing it out there.

but remove the mana regen from pros ring and replace it with like 6% CDR

yes? no? tacos?

Early game CDR would be imba.

The mana regen on Prospector's ring actually puts it in a really nice place for people who want to balance survivability, ap, and mana sustain, although with BFT coming into play Haunting Guise component start is probably going to be pretty popular.

6% CDR is just... meh.
Needs like, 10 to actually be worthwhile getting, but then its retarded strong.

I say just leave Ring as is.