SoV certainly needs help, but the obvious problem of Fractal remains. As with discarding, these are irreversible effects because there's no repeatable way of achieving their opposite effect. This leaves proactive measures as the only countermeasure for a deck that isn't fast, and card game history has shown that proactive measures alone have never been enough to make control decks consistent.
The problem is heavily compounded by the fact that Steal is in element with SoV and, I assume, this creature, which removes most shields as a proactive countermeasure. This essentially leaves Enchant Artifact as the only counter for non-Momentum Scorps and that is, in turn, countered by buffed ones (which isn't hard to fit into a trio). To further complicate the matter, Eclipse adds 2 attack to every single Scorp, which most shields can't block. On the flip side it's terrible against a rush. Extremely polarizing effects like these have never shown to be healthy for a game.
Dune Scorpion was exactly Titanium Scorpion while in beta (0 attack), but it was completely revamped because testing showed it was far too strong vs control (and quite alright vs aggro too) since we have no graveyard and Elements doesn't keep track of past events. I do think Black Scorp could be balanced if it wasn't Death or Darkness and started with 0 attack, however, since there's no buff-on-a-stick card.