Updated to show how I have her geared out nows. I'm a rebel so I use Friggas. There are probaly "better" ways to build her, but this can shred Ultron withouth him phasing and that's my bench mark.

BIG DISCLAIMER HERE:

I do not care about TTK, I care about comfort. This build can survive almost anything as long as you pay a little attention and use med kits every now and again.

Simple rotation that is pretty much use everything on cooldown and Soul Sever at max stacks.

can easily swap to third power on row 1 and row 3 and second power on row 2 for a bit more ranged damage and a different demon. If you do might want to run Jessisa Jones as a tank as S'Ym will go away. For this set up swap fangs over soul brand and pact over back from Limbo.

Infinites can really be whatever you want though I hihgly reccomend +6 to fighting and energy then a little bit in defense rating to get you going. After that you 100% want to max mental focus ASAP. Magik is a crit girl.