Orikanstar has been on my mind quite a bit lately. Probably because it's awesome.
CAD
Orikan the Diviner
Varguard Obyron
Lychguard w/ Shields x10
Warriors x10
Warriors x10
Gauss Immortals x5
Gauss Immortals x5
Tesla Immortals x5
Tesla Immortals x5
Destroyer Cult
Destroyer Lord (Voidreaper, Phase Shifter)
Heavy Destroyers x3
Destroyers x3 (one Heavy)
Destroyers x3 (one Heavy)
Destroyers x3 (one Heavy)
Destroyer Cult brings the big guns and
MSU. Warriors/Immortals create bricks of bodies that are difficult to chew through and put out lots of shots. And the
DLord/Obyron/Orikan/Lychguard star is all but unkillable. Put Obyron out front for a 2+ rerollable against non AP2 weaponry, elsewise have Lychguard with a 3++ rerolling 1s and a 4+
RP.
It's a very straightforward list. Silver Tide with lots of ObSec and an extremely durable Deathstar that can provide cover to lots of units by being an anti-charge deterrent and general wall of bodies.
The list lacks a lot of movement, meaning it will have to basically only play midfield and backline, but it's also fairly durable (being Necrons, after all) and has a lot of firepower, especially once things start getting into rapid fire range. Obyron's Mantle can possibly be used to Deep Strike towards gunline armies, providing a sudden surprise, but that's fairly risky.
Edit: Of course, I could put the Immortals into 2 units of 10 rather than 4 units of 5, but that's a difference of more ObSec field coverage vs harder to kill units.