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We play 1850pt games. My army is custom chapter SM.
What kind of SM list would I need to put together to beat the following CSM list?

Deamon Prince with WarpTime
10-man Plague marines sqd
6-man Noise marines in Rhino with Blastermaster and sonic somethingerother
Possessed LR with 10-man Khorne Berserkers
Abbadon and 5-man Termie sqd
3 Obliterators
Defiler with battlecannon

Any help would be greatly appreciated.

Take a deep breath. This list is not that good.

DP has no wings, very slow.
PMs don't have a Rhino, very slow.
6 NMs aren't durable enough. Remember that the Blastmster is Heavy if it fires the small blast.
LR with zerks is only one squad. Let it eat something and feed it a counter unit.
Abby+buddies is only good in a Raider. Ignore them on foot.
1 Oblit squad is plasma or LC fodder. They're not as good with no lash.
Defiler is alone, shoot your AT at it first.
Target list:
Defiler
DP
NMs
oblits
PMs

Well, I'd take 10 normal Termies w/ cyclone (x2) and 10 Assault Termies with thunder hammers led by a Librarian w/ terminator armor, storm shield, nullzone, goi.
Add 2 Tacticals led by Sergeants with power fists and 1 Scout squad w/ sniper rifle (x5) and bolter (x5). The bolter Scouts could infiltrate if necessary.
This amounts to 1500 pts.

I'd add two Attack Bikes w/ multimelta x2 as a squadron.
1600 pts.

For the remaining points I'd take 2 Vindicators.

Oops, the DP had wings too.