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What do you all think of this list?

2 units of 20 plaguebearers
1 unit of 30 plaguebearers
Epidemuis
1 unit of 3 plague drones
1 Nurgle Daemon Prince General w/daemon blade and Lord of War Command trait

Foulrain Congregation
x3 plagueclaw catapults
plague priest w/beguiling gem

1980

First off, this is a strong list and I don't think it will have problems winning games. Secondly, plaguebearers (or any daemon battleline troop) are least efficient at 20 models. At 10 models they can fulfill minimum requirements for battleline/battalions, while at 30 models they get the most use out of their unit-size bonus. It is better to run a unit of 10 and a unit of 30 than two units of 20.

Now as for the list itself, the main issue is that daemons of nurgle (ironically) don't have the best synergy with Epidemius; rotbringers do. Since two of his benefits are re-rolling wounds and hits of 1, respectively, the models that benefit most will be the ones with good values there to begin with.

For example, a plaguebearer hits on 4s. If he re-rolls 1s then he is getting a second chance on 1/3 of his misses and goes from an average of 0.5 hits per attack to 0.58.

A Putrid Blightking hits on 3s. If he re-rolls 1s then he is getting a second chance on 1/2 of his misses and goes from an average of 0.66 hits per attack to 0.77; a greater benefit than the plaguebearer.

In simple terms this all boils down to models getting a larger benefit from Epidemius the more elite they are. So strengthening the list would mean stripping the plaguebearer units down to 10-man, removing the blight drones, and filling in the gap with rotbringer units/heroes. However, Matched Play is about finding the right power level for your community/opponents, so making the list stronger may not be the right choice.

Those are all really good points. Taking your advice I made some changes.

3 units of 10 plagueberarers
Epidemuis

3 units of 5 blight kings
1 harbinger of Decay General lord of war command trait, favor of the gods or daemonblade
1 Gutrot Spume or Festus the Leechlord working out which I need more, support or melee tank

Foulrain Congregation
x3 plagueclaw catapults
plague priest beguiling gem

Think I will run into problems without having a behemoth on my side?

You wont have problems with that list, it's very strong. I would be more wary of it being too strong for your local meta than it being too weak to be competitive.

While Gutrot Spume is the single model who benefits most from the tally, I think Festus takes the edge because he can heal the all-important Epidemius and also toss out a spell every turn. Plus his signature spell is awesome.