I was so excited for a special Dark energy...but, I agree with everyone that this one falls a bit flat. It might be marginally better if there were Dark types with Omega Barrier to at least keep the energies attached...but, even then I see it as only being a regular energy that might occasionally offer a perk. Usually EX-specifics have bigger and better effects (like Silver Bangle, Safeguard, Gold Breaker, Intensifying Burn, etc.). I suppose with the seemingly big push by TCG into a hyper EX world, and with the rotation of Rocky Helmet and Rock Wall, it has some vague usefulness...but, barring any unrevealed combo cards/abilities/ancient traits, it's a bit of a letdown (though better than nothing).
Sableye is interesting and very Sableye-ish to me. Initially, I didn't read it carefully enough and thought the supporter's effects would be on the opponent (so felt like Juniper/Sycamore-ing them out of cards). Then realized it was like Silent Claw (Plasma Liepard) with the discard pile - which is more reliable because you know what's there, versus the mystery of the person's hand. It's a good way to get the effects of 2 supporters in 1 turn (use your own, then use this move). Double Team Flare Grunt, Wally something up twice, get 4 basics with Fan Club or 6 normals with Winonna, etc. I think it has a lot more potential that may be realized - an ancient trait Bunnelby could make an intriguing partner.