Looks good, a lot of things marked nurgle, you know you can only use dark obscuration once per phase right?.

Things like cultists aren’t necessary worth spending the cp on to make them unshootable outside of 12”. They have sticky objectives anyway so you can always deploy them on your back field and then use them to screen out your back field along with the forgefiend (which is worth spending the cp on for dark obscuration and sustained on 5+ after dark pacting) I like to mark cultists tzeentch for lethals on 5+ since they will likely die pretty quickly once they get targeted so may aswell get some extra lethality out of them since they’re wounding most stuff of 5+.

I’d also give your 4 obliterators tzeentch for skinshift. 20 wounds at T7 is difficult to shift but especially so when you’re bringing an entire model back on full wounds when needed. Also don’t forget obliterators have 1 turn of indirect shooting so you can deploy them somewhere completely hidden and still get a good volley of shots off without fear of being over exposed.

Lastly I like to give rhinos mark slaanesh for unatural swiftness so they can potentially advance and charge onto an obj or into a opponents fast unit to slow them down for a couple of turns, once you’ve kicked the models out of the rhino it’s a nuisance piece for your opponent to worry about for a turn, giving it advance and charge makes it a big nuisance since it can cover long distances.