Alas, the Chaos Sorcerer no longer works on Legion of Azgorh. My allies of choice for them have been Gutrot Spume and 5 blightkings, plague priest, blue scribes with endless spell of choice, slaughter priest(s), Daemon prince of Khorne and mindstealer sphiranx cat recently, contorted epitome....in any permutation you like.
Many folks like the forbidden power bridge and boatman for the slowpoke infantry of Azgorh. I’ve notnused then but seem to be pretty solid. Blue scribes and prearranging the models are key to making those spells work.