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You have the hammer and anvil strategy. You do have Ahriman and the other sorcerer to give warp time and diabolic strength to Mortarion to sling shot him.
Also we have the option to cut our opponent from firing at the plague marines so it should be nice.
The warlord will be the Deamon prince which will get the 4+ FNP trait. I feel like this list is brutal and it should perform quite good on the table.

Death guard Battalion Detachment:
HQ:
Typhus
Malignant plague caster
Troops:
Plague marines - 12 men champ with power fist + plague sword 2 plague marines with Flail of corruption and 9 with Bubonic axes Icon
2x Poxwalkers - 20 men units
Elites:
Noxious blighbringer
Plague surgeon
Tallyman
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Chaos Supreme command detachemnt
HQ:
Ahriman + disc
Exalted sorcerer + disc
Death guard deamon prince + suppurating plate + 2 talons + wings
LOW :
Mortarion