I'll just comment on the Shadow for now. I would probably go for
Mumak Chieftan over
Mumak Commander. For the Commander to work, there needs to be 6 companions and 6 threats, which isn't too likely. Chieftan allows you to play a free
Mumak which is always nice. Personally I think you need more minions because as it is you need to spot a minion to use the Southron Invader's ability and the Commander also requires a spot. Without using
Ships of Great Draught a lot or if the opponent has good possession removal, you could be in trouble. Other minions that you could consider in the deck would be
Southron Fighter and
Southron Traveler, if you keep the ambush route. The other thing that you should consider is adding cards like
Whirling Strike or
Red Wrath. If you add the twilight from ambush and Mumaks, you should be able to pile on some extra wounds that way too.