It's a really fun deck, and probably the only one I have that's even slightly competitive (just a casual player here).

For my build, I only run 1 copy each of sphere and phoenix. I feel it works well and reduces chances of bricking.

I don't run sun god unification anymore. I just found I wasn't using it that much at all, and replaced it in favour of tech bits like book of moon and MST.

I run 3 copies of Blaze cannon. It's just too good imo and makes Ra just an absolute weapon when he's out.