Frankly, a lot of the GX decks would be like D-HEROs. I mean let's break it down.

E-HEROs, are common, end of story. but Neos and the Neo-Spacians? Utterly unique to Jaden and far as I know, he had the only copies of any of them.

Cystal Beasts? I think the only deck of them was given to Jesse directly by Pegasus himself. And there was only one copy of each one if we're going by the fact that Jesse was missing Sapphire Pegasus and only seemed to get one copy of the card when he finally did get it.

Cyberdarks had to be guarded and Zane had the only copies of those cards after taking them. Well until Cyrus got them later.

And I think even Acient Gears were considered to be rare in that series, Golem in particular getting mentioned in episode 1. Crowler's deck even came back with improvements in 5Ds.

And if the Light of Destruction infecting darks makes them unprintable, I think we can completely forget someone using an Arcana Force deck, cause I think all of those where infected.

Also, it would no surprise me if Pegasus found some way to reprint the cards without any nasty side effects. I mean it's frikin Pegasus. Even without the millennium eye he knows more then most people.

BTW, also posted on Titan Pad.