Quote (Vulpix0r @ 8 Nov 2012 04:27)
Is there a viable magic missile/arcane orb build?

I know there is that ww/frozen build but I really want to make mm/ao work.

Arcane orb cc on soj, source, whatever and plenty of apoc.
Can also get MM damage on a weapon, etc.
Move speed will be a lot more important for an aa/mm wizard and efficiency is almost out of the question with regards to CM wizard speed.
The best rune is celestial orb for this in general (I think that's the pierce rune?) as it allows more ticks and as such more AP to spam AA with.
MM with seeker allows for extreme kiting around corners and across long distance with fire and forget.
The build is a lot of fun - that is undeniable - but never as efficient.