My friend's most recent list was something like:
Sloppity Bilepiper
Great Unclean one (bell + dagger) (Witherstave)
Gotrot Spume
The Grand Cultivator (Horticulus Slimux?)
Rotbringer Sorcerer
5x blightkings (deepstrike with gotrot)
30x Plague Bearers
10x Plague Bearers
3x Plague drones
3x Plague Drones
2x Beasts of Nurgle
3x nurglings (deepstrike)
----
What I often find is me having 10+ casts per round I tend to melt a lot of the important targets before they reach me and/or sniping the heroes to break the synnergies. Once they reach my army my wall of pink horrors often means I'm still safe for a round or two. Objectives I often win by having quick flying heroes summon near objectives and simply drowning the enemy in blue / brim horrors. Neither of us are using endless spells atm, I'm afraid introducing it would further increase my power, but maybe not? Since my friend will have access to stuff like cogs / lifeswarm.