This list is created solely as my best chance at finally beating an unbeatable Cygnar gun line. Normally we play standard caster kill scenarios as we're pretty new to the game, but hopefully we'll start playimng some scenarios. I made the list with that fantastic app iBodger
Battlegroup
Master Necrotech Mortenebra +4
(Deryliss)
Deathjack - 11
Helldiver - 3
Leviathan - 8
Reaper - 6
Slayer - 5
No Battlegroup
6 Scrap Thralls - 2
2 x Warwitch Sirens - 4
Tier 4 so my scrap thralls gain advance deployment, extra 2" to my deployment (So scrap thralls and Deathjack can start 18" up from my board Edge!) and thanks to the warwitch sirens my Helljacks all have stealth in the first round.
Just a simple run up the field as fast as I can list, aided by Stealth and Advanced Deployment. The Scrap Thralls are there to provide a seperate target to the Deathjack while Mortenebra hangs back with the leviathan, casting Terminal Velovity while Deryliss casts Overrun on whatever warjack needs it, proabaly Deathjack to keep him moving and in Trample range of units. The Helldivers there to annoy the opponent, and if playing a scenario try and get behind the enemy for targets of opportunity. Maybe even a caster kill if the right conditions come up.
Ideally i'd have a list of four slayers and two sirens (minimum for tier for) and have the rest as helldivers, but i'm not sure how that would play out, and i don't have the models for it :(