Going into Murkmire, I knew I was going to have a difficult time finding a mag sorc build that would work for me. I used to run Alteration Mastery with Shackle and found great success with that combo. But the shield changes killed the build and after cycling through a Pariah setup, a Twilight pet setup, and a conpletely ridiculous but unreliable calurian/sloads setup, I think I have a build that suits me.
Armor Master, Alteration Mastery, Slimecraw.
Armor master back bar, like the majority of mag sorc builds. Solid defense plus, hard to not run it.
Alteration Mastery both bars. This set is too good, imo. Cheaper everything. Paired with roll dodge cp and sorc ultimate cost passives, you can drop meteors for cheap and roll dodge effectively quite a bit.
Slimecraw. Minor berserk, paired with Power Surge back bar for Major Sorcery. Gives you 3k spell damage before enchant proc.
Willpower fire stave from bar, Nirnhoned.
All max mag enchants and spell damage enchants. Tri stat food for the stam. You end up with 35k mag, 14k stam, 22k health in Cyrodil, 1200 mag regen without a potion. The mag regen seems low but Alteration Mastery balances it out. I know Lich provides better regen, but I personally have never cared for the set.
Front Bar
Meteor
Rune Cage (That's right, keeping it here. It works to some extant and avoids the need for reach without the master's staff)
Force Pulse
Frag
Curse
Wrath
Back Bar
Greater Atro
Power Surge
Hardened Ward
Annulment ( morph of preference)
Streak
Blessing of Restoration (decided to try this over mutagen or healing ward. Works pretty well and provides a solid burst heal alonside minor resistances. You could run combat prayer but would need to pick a new monster set.)
I don't have much in terms of gameplay. But I do have a short BG clip that demonstrates the damage output.
https://1drv.ms/v/s!AnK8ogRltuRSe0JuYk-oLoU73xc