This is a joke list, of a sort. The question is if it's a workable joke.
++Word Bearers Grand Host++
+Lords of the Legion+
Palanquin Sorcerer of Nurgle, w/ ML 3, Spell Familiar, Malefic Tome - 190
Same, minus Tome - 180
+Lost and Damned+
Dark Apostle w/ Scripts of Erebus - 120
20 Cultists - 90
20 Cultists - 90
15 Cultists - 70
15 Cultists - 70
+Helforged Warpack+
Warpsmith w/ Combi-Meltagun - 120
Defiler - 195 - Warlord
Forgefiend w/ 3 Ectoplasma - 200
Forgefiend - 175
Forgefiend - 175
++Daemon Ally Detachment++
Herald on w/ ML 2 Paradox and Exalted Locus of Conjuration - 120
11 Blue Horrors - 55
Edited the list. Dropped a Disc from the Herald, turned one of the Forgefiends into a Cerebrite.
The Defiler benefits from an improved save and Challenging hidden Meltabombs due to being a Character. Depending on its Warlord Trait, it can either grant orders via Voice of Lorgar, alter mutations with Nexus of the Gods, or be a ML 1 Malefic Psyker. As a Daemon and a Word Bearer, it's able to safely reliably summon. Cultists bubblewrap. Sorcerers and Herald summon, and ideally get Cursed Earth for a 3++ Defiler, though the Herald can also grant Prescience to a Fiend or Defiler. Fiends are mostly for range, to stay in range of the Cursed Earth bubbles, and to punch through Void Shields and other nasty stuff. Warpsmith took a Combi-Melta to double-tap a trouble target. Because everything else has Crusader, the mob is faster than it looks too.
Competitive? No, but it's not a complete pushover. Hilarious? Absolutely.
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