It's also funny because this card was one of the first to use such an abstract concept
For source differences, the Cardmarket vs TCGplayer Pokmon prices comparison explains why the same card can show different regional ranges
Japan Showcase Cards Japan Showcase cards are a Booster Fun variant thats present in most Standard releases
Five cards are included in the Ghostbusters Slimer Secret Lair drop, along with a bonus card that hasnt been revealed at time of writing
The full spoiler has confirmed a few cards which had been previously leaked or previewed but not verified by Wizards of the Coast as legitimate - specifically, the non-masterpiece version of Paradox Bridge (from our December 28, 2016 article) and four of the five Story Spotlight cards (from our December 06, 2016 article)
For investors, thats exactly why its attractive: its an undervalued legendary Pokmon card