I feel like I'm going horribly off topic, but at least this is pertaining to aether which is a bit relevant to SoW I suppose.
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I was trying to prove SoW is not OP because it rely on some otherwise weak cards to make a combo, this combo just slight better than Charger + blessing.
While Charger itself doing some reasonable damage without placing a spell on it, and not going to damage yourself.
As I said before, now we have some good creatures in Aether, but without SoW, those SoW relevant creature or spells almost only being counter against CC.
I don't think we should focus on a single card to tell it is OP or UP, we should look at what a card can interact with.
For the overall combo:
UP? It traded something for its stability.
OP? Still situational, and counterable.
Not the best design? Maybe, though IMO some card without much variability, is a variability in the game itself.