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I have a fluffy game coming up for my buddies last game before he leaves. I switched to Tau a while back, but Im playing CSM for this scenario based event. It is a defensive mission, with me on the defense.
Not wanting to be super competitive, but don't want to be steam rolled. Im playing against Tau and Space Wolves. Will most likely see a Stormsurge and lots of thunder wolf cavalry.

Cyclopia Cabal
4x lvl 1 Sorcerer on bike with spell familiar
all telepathy

Mayhem pack
3x Helbrutes powerfist and multi melta

CAD
Daemon Prince of Nurgle
lvl 3 wings, spell familiar-telepathy

Chaos Cultists
4 squads of 10 with 1 flamer each

Forge Fiend
2x Hades Autocannon

Defiler
Power Scourge battle cannon, reaper autocannon

Renegade Knight
Meltagun
Reaper Chainsword
Rapid Fire Battle Cannon

Call me crazy, but I would try working in a Warpsmith in that list...Especially if you are playing on the defensive. I would wrap him in a 20-man cultist unit and have him loiter around everything. You would need to drop either a sorcerer from the Cabal, or the daemon prince, in order to work him in, though. Personally, I would drop a sorcerer, as removing that one additional Warp Charge probably won't detract much from your list.

Warpsmith would be good near the 2 daemon engines, to keep them alive.

And the shooty knight

Edit: I though you were running 2 gatlings on the knight, but on second glance, that's not the case; still, repairing damage early in the game will only prolong the knight's productivity. Later in the game, I don't expect the Warpsmith to keep up with said knight, but any damage repaired is a good thing. Plus, the 'smith is no slouch in combat...And if your opponent targets him early, it's so much the better for the rest of your army.

If you are going to play defensive - ally in Renegade & Heritics, Heavy artillery, cheap anti-tank, cheap Spawns, fearless hordes and the whole IG armoury.