EricBasser wrote:How many points are you looking to build for your list?
Burning Skyhost, Screamer and Chariot formation, doesn't seem the best rules wise.
I would suggest trying/proxying the army first. I've got a Incursion/
CAD list that runs Warpflame Host with 5 Exalted Flamers (Conversion will be cheapest here), 3x 3 Flamers, and a 11 Pink Horror Squad. With Fateweaver and Lord of Change. Furies as the tax.
CAD I run 2 Tzeentch Heralds and 2 more squads of Horrors. Lord of Change is my Warlord and a Tzeentch Herald has a Endless Grimiore. So Fateweaver and
LoC can fly around and summon Burning Chariots.
I'd run it as a summoning/shooty army when needed. This might be a fluffy/not terrible list that still uses Burning Chariots. And, if you like the who Tzeentch aspect, Summoning other faction daemons can be fluffy. Think of it as Tzeentch decided to pull those Fleshhound from Khrone and nonchalantly place them next to those Marines to see what would happen.
With that said, I still like the idea of a army full of turbo-boosting, flat-out moving models that hurt things they fly over. And if you go the Burning Skyhost route, let me know how it goes. I would probably do 8 Burning Chariots, 1x 9 Screamers. Then depending on points, try for 2 Pink Horrors and more Tzeentch Heralds to make Screamerstar. If you have the points Balekor.
Hope that helps some. I'm not a competitive gamer, but that just seems to get a fluffy Tzeentch list working. Good luck with the list building, and let me know how it goes.