Seems quite balanced but limited. I would suggest being able to cast it on any kind of creature, with a bonus to immaterial creatures.
This. It's very useless in its current form. The only reason you would ever use Reflector+SoW is if it's in a restricted environment where Antimatter is banned or something very situational like that.
Monoaether already counters itself with Silence, and making immaterial creatures have semi-momentum is naturally even less useful than actual Momentum, which is a combo that's never used in PvP.
I think you should go over-the-top with the Aether shard too, Zanz. When I see extreme stuff like SoBe and SoSa, I think back to the old idea of the Aether shard being Lightning on a stick. That would be so awesome. 'Cause the thing is, Aether is the element of awesome thunderbolts and explosions in space. Not this pussy-footing around.
(I'm fine with the concept of Wisdom though. It's just the mechanics I feel cheated on 'cause everyone else get extreme stuff.)