Several factors influence 151 card values: card condition (mint cards worth 3-5x more), rarity (holographic and rare cards command higher prices), first edition status, PSA/BGS grading scores, and market demand for specific Pokemon
There are also entire sets with specialized alt art versions, like Kamigawa: Neon Dynasty or Wilds of Eldraine, where you can open boosters and find these stylized cards right inside the packs
Its hard to counterfeit older collectables like rare baseball cards, comic books, and vintage action figures
Just a few dozen copies are known to exist at all, with only a single copy ever rated at a perfect Gem Mint 10 - an effectively flawless condition - by grading specialist PSA
It's Magic, with a cosmic spin