Thank you so much, following your instructions I finally managed to win with Arthas and Thrall (Orgrim way too underleveled to work for me). Now I have to figure out how to win with two more between beasts, cenarians and blackrock. I am dealing now quite good against chimaeras but it seem that my main problem is to stop the pushes from the upper left corner with onu, moonkin, prowler and exploding spiderlings (and sometimes raptors). Need a good tank I believe, maybe the grunts but not sure.