if you can have mounted daemonettes (you dont say which GT, if its not the UK then you can, mostly) then you can make this list much harder. take 2x siren bikers, and just turbo them around as 24" moving summoning portals.
Lord. Bike. Icon. MoS. Daemonic Armour. Sorcerer, 6 minor powers (aieee) bolt pistol, darkblade, d.strength, combat drugs, frags
Lieutenant. Bike. Icon. MoS. Daemonic Armour. Sorcerer, 6 minor powers (aieee) power weapon, frags
6 daemonettes - 90
6 daemonettes - 90
6 daemonettes - 90
6 daemonettes - 90
6 daemonettes - 90
6 daemonettes - 90
6 mounted daemonettes - 168
6 mounted daemonettes - 168
6 mounted daemonettes - 168
1500 (ish)
if you fail to get siren, somehow, on both bikes, they've still got a 2+ invul to save them once they come out from hiding.
if one of the bikes gets siren but the other doesn't, the other one is still an IC so can't be targetted in shooting, so i think you can't shoot the siren, and you also can't shoot the non-siren because its not the closest target...
the pts might be wrong and i think you can fit in some more combat stuff like spikey bits or more siren rolls. the other minor powers are actually pretty good, like fueled by pain.
the lord has str8 all the time not just on the charge, and strikes before YOU.
i think this list is utter filth and very few things would stand a chance... everything can get rended even skimmer walls.
purely mechanised eldar is a nightmare though as they can escape you, and genestealer horde will defeat the daemons, and witch/demon-hunters obviously. everything else will just die