Pokmon TCG Pocket has significantly different rules from its source material, as it does not use the prize card system and its decks are only 20 cards, as opposed to the original game's 60-card deck size
Its quite easy to turn on, gives a big advantage to decks like Affinity by producing colored mana of any type, and works particularly well with Urzas Saga
"A friend of mine suggested it would be a great piece of content with so much room for optimization: feel like a kid again, put on a great show, turn a profit, raise money for charity, and amplify an industry," Paul said
That correction is actually a positive sign for long-term collectors, because the current price is supported by real demand from people who want to own the card, not from speculators hoping to flip it
Combine that with the enduring popularity of the Eeveelution line, and you have the recipe for a highly sought-after set.