Didn't Shallaxy come later, though? About the same time as Vallassa, Pyro, Ryv and Aria? Seems to me SP might have gotten shorted a hero.
I think they got released 1 per expansion, Magnus being the first and Shallaxy the last. I also feel the Vallassa, Pyro, Ryv and Aria cycle should get completed. And then there is Sarinda and Ctharia.
Old Shallaxy was pretty awesome. Deploy Rock Trap, Gravity Well, 1-3 range, and Deflect/Battledrum as upgrades (I think Evasive 3 was another upgrade option and there was something else I never picked). Now it's pretty bland and (imo) overcosted because of gravity well. I don't think I've ever seen anyone post on the forums demanding that Shallaxy keep gravity well--it's just not that useful but it's stuck on base...