Our daemons are expensive mostly because of how resilient they are, for instance; 30 plaguebearers, I’ve had entire combat armies attack one of these units and barely take it off after 3 combat phases, add in a lord of blights, witherstave and the rerolling wounds portion of the wheel and you have something nigh invulnerable to anything short of mass mortals.
Now onto your 1250 list @peasant I would drop the beast, nurglings and life swarm, put in 3 more drones and swap the sorcerer to blades as well as having the extra command point and triumph, as your damage is going to mainly be from the drones, but the kings should be putting dents into things at that point limit, the idea here is to maximise your damage while your Guo pins units down and tanks, lifeswarm wouldn’t be as handy army wide as you won’t bring models back, and it’s nothing that smart wheel manipulation doesn’t do already.
I’d personally do something like this;
Allegiance: NurgleMortal Realm: ShyishLeadersGreat Unclean One (340)- General- Bile Blade & Doomsday Bell- Trait: Pestilent Breath - Artefact: Ethereal Amulet - Lore of Virulence: Sumptuous PestilenceSorcerer (120)- Lore of Malignance: Blades of PutrefactionBattleline5 x Putrid Blightkings (160)5 x Putrid Blightkings (160)Units6 x Plague Drones (400)Total: 1180 / 1250Extra Command Points: 1Allies: 0 / 200Wounds: 97
Other option is to do endless gift on the general, because as nice as a unrendable 4+ save is, healing each battleshock phase is nice, another option would be a doppelgänger cloak, can’t kill what you cannot hit!
Anyway you go I wish you the best of luck for your tournament.