Around the time of [HeroClix] Sinister we did a promo variant of the black-suit Spider-Man figure based on "Spider" from the Weapon X team in Exiles (where Peter Parker merged with the Carnage symbiote). He got as far as our first pair of production samples, but never came out for one reason or another. I was given one of the samples as a gift, and the other is in the WizKids archives. As far as I know, that's the rarest HeroClix figure in existence.
Seth Johnson, HeroClix World Interview (2009)