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Just wondering how competitive you guys think this will be. I will post the alternatives that I have at the bottom.

Warwitch Deneghra
Defiler
Wraith Engine
Bane Lord Tararus
Pistol Wraith
Pistol Wraith
Skarlock
Bane Thralls W/ banner and captain
Blackbanes's Ghost Riders
Mechanithralls
Necrosurgeon & Stitch Thralls

The Idea is the units will supply themselves while the Wraith will buff the Ghost raiders and the Pistol Wraiths. I can also use the Smoke Screens to cut off any ranged attacks. Bane Thralls will be my main unit to attack any Jacks. Hopefully be able to pop Deneghras feat turn 3 and wipe the units to focus on the caster or jacks.

I also have Satyxis Raiders with Sea witch, Machine Wraith ( I don't play him because my FLGS is about 70% Horde), Warwith Siren, 2 Death Rippers, Slayer Jack

pDenny really likes her arc node and with only the defiler, you're gonna come short. Add at least 1 or 2 Deathrippers to that. The Warwitch Siren is going to be especially good once you get to 3 arc nodes. You really want to get those debuffs on appropriate targets.

I'm not sure about the wraith engine + Blackbanes combo as I haven't tried it, but it seems too pricey for what it does to me. I would actually add the Satyxis Raiders + UA instead, giving you a saturation of threat. On the + side, Satyxis raiders are going to be of great help against ranged attack list.

And if you're able to pop feat turn 2 on the alpha strike, you're going to be in a much better shape than a later feat. Also, try to set up assassination on the feat turn if possible. -5ARM is devastating for warcasters. Warlocks will need a lot of Furys to transfer all that damage. Do not use feat to get rid of units, it's a waste of ressources, either assassinate or get rid of Heavies and Jacks. Your troops can already remove infantry easily.

Last thing, Pistol Wraiths are amazing, but set them to go at the right targets. Shut a Beast or Jack down, or buy yourself a turn against casters, that 3rd paralyzing shot is key... use it well.

I agree with cloudsabacc, on the unit recommendations, though worrying about feat turn assassination isn't as important in my experience. Any armor penalty is enough to mess up 90% of casters, their defense is more of an issue. That's where your arc nodes come in. With a lot of them, you can run one to within 3" of the caster and loose scourge. At that distance, it can't miss, and you can just swing away with another unit.

I love the wraith engine, but for a truly competitive list your better off with 2 nodes for those points.

I'd drop the wraith engine and possibly defiler for 2 four point nodes, then 2 Warwitch sirens and maybe Gorman.

The blackbanes getting extra armor really doesn't help them (there are almost zero spells/magical attacks that won't outright kill them even with the +2) and if they kill anything they steal souls away from the wraith engine.

Addendum: I just noticed what you had. I would run:
pDenny
-Deathripper
-Deathripper
-Skarlock
BLT
Pistol wraith x2
Machine wraith
Full banes w/ UA
Full satyxis w/UA
Full mcthralls
Necrosurgeon
Min blackbanes

It'd be nice to squeeze the WWS in, but just not enough points. Basically have the raiders jam, with the mcthralls and stitch thralls as close as they can get. With luck you can pull some corpse tokens when they get stuck in the enemy lines lines. Mostly the same plan like you had, but the machine wraith is purely as an objective grabber or contester. Even vs hordes, magic weapons aren't that common, and with blackbanes and pistol Wraiths around, the 1 point model will be low priority.

You can even use the blackbanes to jam and threaten free strikes. Fire and more ghosts make most infantry think twice about trying to move through them.

Lose the Wraith Engine. 9 points of beautiful model and a screaming waste of space.
With all the infantry you have you're missing a method to handle heavy armor, or warbeasts/jacks.

Without a backup arc node your spell assassination run is going to hinge on not losing a node. Replace the Wraith Engine with 2 Nightwretches.
Another concern is that you've got an infantry swarm that could get in the way of itself. Assuming each unit is maximum size the mixed speeds could cause you issues with pacing each wave.

In Steamroller you might have issues with the clock.