Hmm...my first reaction to the SoW change was that this + Phase Recluses + TU would be OP similar to how Phase Dragons + PU used to be OP back in the old days. So then I tested it. Turns out it's not that bad. Ranges from 5-7 turns to win on average with a well built deck, but crumbles to shields and CC pretty easily. Not too much different from how your standard TU Recluse rush is right now.
But then I tried Psions...
Psions are slightly slower, much more difficult to kill off with CC, and are indifferent to shields minus the reflectives. I'm seeing it hover around 6 turns to win right now, and TU spam in addition to the Psion's above average bulk makes it scarily hard to stop. I'm not really sure if this signifies that it's a broken combination (I myself am undecided on what to think about it), but I'm still worried about having a buff in the same element as TU regardless.
And I haven't tested it with Immaterial creatures given that I was fine with it before the change, so I see no reason to change my mind now.