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Here comes a CSM list with Daemon allies:

1850 Chaos Space Marine Army with Chaos Daemon Allies (1847 Points)

Chaos Space Marines

HQ:
Chaos Lord; Chaos Bike, Sigil of Corruption, Mark of Nurgle, Lightning Claw, Powerfist, Blight Grenades- 170 Points

Troops:
10x Chaos Cultists- 50 Points
10x Chaos Cultists- 50 Points

Fast Attack:
Heldrake; Baleflamer-170 Points

5x Chaos Spawn; Mark of Nurgle- 180 Points

Heavy Support:
2x Obliterators; Mark of Nurgle, Veterans of the Long War- 158 Points

2x Obliterators; Mark of Nurgle, Veterans of the Long War- 158 Points

Chaos Daemons

HQ:
Great Unclean One; 2 Greater Rewards, Psyker Level 3- 280 Points

Troops:
10x Plaguebearers of Nurgle; Plagueridden, 1 Lesser Reward, Instrument of Chaos, Plague Banner - 135 Points

10x Plaguebearers of Nurgle; Plagueridden, 1 Lesser Reward, Instrument of Chaos, Plague Banner - 135 Points

Fast Attack:
3x Plague Drones of Nurgle; Plaguebringer, 1 Lesser Reward, Plague Banner- 181 Points

Heavy Support:
Soul Grinder; Daemon of Nurgle, Phlegm Bombardment; 180 Points

The idea of the list is all about flexibility.

It gives me the ability to deep strike and/or reserve half the army if need be and/or provide overwhelming force in one part of the battlefield when needed.

The trick is that there are so many threat vectors that the opponent has to choose one at the detriment of the others. Does he go for the Nurgle Spawns/Lord combo, hoping to drown it with volume shots before the unit gets into CC range, or does he pick off my long ranged support which is in and of itself pretty tough? If he ignores the Plague Drones, I could precision drop on him in one turn a GUO and a whole squad of Plaguebearers, firmly planting in his backfield a massive threat to counter.

It's a Nurgle army with speed, durability, and punch. I wanted to work a Brand or Daemon lord into the list but ran out of points.

I run a very similar list and it works well. The main weakness you are going to face is that first turn when your opponent goes first. Tau and Eldar are going to bring the hurt. You should consider an aegis line with a coms relay for both the protection and for the assurance that your reserves will come in when needed.