I'm taking on Fist of Medusa Iron Hands marines. I haven't played my Necrons in ages (like 2 years) and i wanted to build a list that could readily counter Imperial Knights, Army wide feel no pain, lots of grav weaponry and other stuff Iron Hands player like to run with.

I want help building a very strong Necron list that's able to compete with Iron Hands tournament lists.
Disclaimer: I do not own any models from the Canoptek Harvest, also no Monoliths so please avoid those in suggestions.

2000 Pts - Codex: Necrons Roster - 2000 - CAD + Deathbringer Flight

: Combined Arms Detachment (67#, 1680 pts)
1 Catacomb Command Barge, 220 pts (Tesla Cannon)
1 Overlord (Warscythe; Phase Shifter; Phylactery; Resurrection Orb)

1 Catacomb Command Barge, 195 pts (Tesla Cannon)
1 Overlord (Warscythe; Phase Shifter; Phylactery)

10 Immortals, 170 pts (Tesla Carbine)

10 Warriors, 235 pts
1 Ghost Ark

20 Warriors, 260 pts

20 Warriors, 260 pts

1 Doomsday Ark, 170 pts

1 Doomsday Ark, 170 pts

Formation:
1 Deathbringer Flight, 320 pts
1 Doom Scythe
1 Doom Scythe

Total Roster Cost: 2000