Spirit Visage on Cassiopeia
good idea or no
good idea or no
no
honestly, visage on any champion that heals is great.

and so on, give them health, MR and much needed heal buffs to their kits, so its actually not a bad item to get if you wanna build something defensive.
not really
I tried it before the MYMU- I think there was much more viability, esp if you built WotA.
I prefer building Banshee's now. But, of course, there's always GA and Abysall.
You need CDR, Mana, AP and penetration on Cass before you can even consider building that item. Oh and let's not forget Rylai's too.