Reflective shields shouldn't be that much of a problem if you are careful enough. (If you fight an opponent with light or life, you should just wait until he puts his first shield up. And even then, you don't have to play SoW, if it looks like you are winning anyway. So reflective Shields in the opponents deck isn't a sure-to-lose)
But this deck needs a lot of time to set up, so some steals and deflags, or a single pulverizer or something strong momentumed on the opponents side are great weaknesses of this deck. (Since you don't use any CC or PC)
Also, you use only three armagio and overdrive, that seems like not much. I would at least replace one shard and one aether tower for another armagio and an overdrive.
Even so, why don't use momentums instead of wisdom shards, is easier to play (cheaper), and armagios with overdrive get stronger even without some +4/+0 boost, that aside, momentum doesn't has any shield disadvantage against reflective shields.