Is there some gameplay reason that Way of the Scorpion can't target Scorpion characters?
To me it looks like it just penalizes scorpion players who use it that get randomly matched with other scorpions, or that bring it to a scorpion heavy meta. Is it a flavor thing? I never got the impression that scorpions were above betraying/dishonoring each other...
If it's meant to keep you from targeting your own characters for some future card interaction, it could just be "non-friendly character."