This is my everyday build for [Mag], the differential from my build and others is that I can actually tank against high level content using her shields

I changed the subsume spot from 1st ability to 4th due to recent changes in her pull ability that is now much more useful than just a panic button
4 ability is just very useful in low level content without the augment, and in this build every single mod is important to be here to make all of her abilities useful

Recommend using archon shards, 2 ambers ones for casting speed and 3 azure ones for shields, I have that on mine now, but it will work even without it
if you can't afford the shards I recommend using [Natural Talent] instead of [Umbral Intensify]