I'd read the same that anavar and creatine make a good combination. I haven't found any studies, though, so how much is just Internet folk lore is anyone's guess.
I think I read somewhere, too, that being on test increases creatine synthesis which would mean little point to taking more but that might also be BS.
For me, the main point to taking creatine is recovery. It helps a lot with recovery between sets and, I find, with recovery between sessions. Since being on aas does that job so very much better than taking creatine, I'd leave creatine to while 'off'.