Here's something that's a bit suspicious.
It's Toy Island's "Super Shadow" prototype figure. Supposedly. He's done in shimmer gold, silver & red hi-spec paint to represent the 'super form'. However...as expensive as it appeared on ebay (over 300 dollars due to 'rare') this is ALSO something that someone could fairly easily just whip up in the garage.
Pearly or metallic paint colors can be easily obtained in a spray can or craft store & since there's nothing unusual about the figure / it wasn't re-sculpted (as it should have been) it could just be a fan-re-paint that someone is trying to pass off as some 'prototype' item. Of course, even companies do this! Paint an item in-house to "represent how they want it to be", so there's no real guarentee either way. Toy Island was also lazy (a known fact) in that they just wanted to represent the super forms as a simple pallet swap so they wouldn't have to re-sculpt anything to wring more dollars out of fans. So, something like this does fit their profile of 'something they would do'. But, for now, it remains a proto-mystery.