So, as it happens, I currently have the models for 3 separate 1k Age of Sigmar armies.
Here's one I put together as a Tzeentch List. I'm a little fuzzy on how all the Allegiance abilities interact (Destiny dice and fate points--can you use both? I thought you only got one Allegiance ability.)
Here's the basics, though:
Gaunt Summoner on Disc
10 Horrors (horn and icon)
10 Horrors (horn and icon)
Burning Chariot
Burning Chariot
3 Screamers
I don't really know which spells to use and I've no idea if this is good or not, but it's what immediately occurred to me.