Hey all, I am wanting to build an 850 point list with a mordor catapult. I am having some issues around building the rest of my list, however.

I will be facing siege engines, and I would like a fast force. If I can incorporate the Shadow Lord this would also give me an advantage. However I am torn between more models, a drummer, shaman and taskmaster (horde combo!) or fewer models with a more beefy hero or maybe a monster. Can anyone give me any ideas for lists?

thanks