The bridge megaturn deck is worth considering. It looks hard work to get enough drawing but if you can trash cultists at the right time you can probably manage it.
The problem is, after Cultist war, there is little time. With Hoard the game can be over really fast. I don't think you can pull off the engine fast enough. If you don't go Cultist, even with Count AND Junk Dealer, I don't see it working out.
I think you want Cultist, then Hoard, and then green.
However, if you open 5/2, opening Count looks like a good idea, and then you can go either into Cultists-BM or into a more engine-y thing.