The blue back is what makes it really stand out, especially for collectors interested in the early days of Pokmon merchandise
If there were fewer, I could maybe maintain a deck for each, but as someone who might play cEDH, Old School, Premodern, Legacy, Modern, Pioneer, Standard, Pauper, and even Vintage, its just too much to keep a tournament ready deck for anything I might want to play
Since it was tied to an in-person play event, that distribution was extremely limited, which has made the card popular with the same crowd of collectors and investors who routinely target Reserved List cards
Consider strong colorless commanders like Kozilek, Butcher of Truth for impactful gameplay in Commander
If one person weighs all the packs in a booster box and buys all the good packs, everyone who comes after them will just unknowingly get packs of weak cards