There are estimated to be about 31 of them in existence

Secret Lair x FINAL FANTASY Bundles For those looking to acquire the complete collection, two language-specific bundles and a super bundle will be available: English-Language FINAL FANTASY Bundle Contents: 1x Rainbow foil Secret Lair x FINAL FANTASY: Game Over 1x Non-foil Secret Lair x FINAL FANTASY: Game Over 1x Rainbow foil Secret Lair x FINAL FANTASY: Grimoire 1x Non-foil Secret Lair x FINAL FANTASY: Grimoire 1x Rainbow foil Secret Lair x FINAL FANTASY: Weapons 1x Non-foil Secret Lair x FINAL FANTASY: Weapons 1x Rainbow foil Gilded Lotus promo card (all cards in English) Price: $199.99 USD Japanese-Language FINAL FANTASY Bundle Contents: 1x Rainbow foil Secret Lair x FINAL FANTASY: Game Over 1x Non-foil Secret Lair x FINAL FANTASY: Game Over 1x Rainbow foil Secret Lair x FINAL FANTASY: Grimoire 1x Non-foil Secret Lair x FINAL FANTASY: Grimoire 1x Rainbow foil Secret Lair x FINAL FANTASY: Weapons 1x Non-foil Secret Lair x FINAL FANTASY: Weapons 1x Rainbow foil Gilded Lotus promo card (all cards in Japanese)

I cant think of a compelling reason to run him in a deck, unless youre dedicated to Specter tribal or just want to make everybody discard as much as possible
Coupled with the supply chain issues that so many industries came across, you just saw this crazy spike in value (and) the massive influx of new collectors who then stuck around is driving a continual demand. Sentimental value is integral to understanding the influx of those looking to capitalize on the investment potential of Pokmon cards
For example, Gurmag Angler doesnt seem so scary when we have Woolly Loxodon waiting in the wings ready to gobble up the Zombie Fish in a moments notice
Collectors who specifically want the JPN Charizard V SA (103/100) or Arceus V SA (112/100) must buy the Japanese S9 set