They reflect the changing trends and interests of the Pokmon fanbase
The blog post explicitly says, though, that if you want all the new Lands (or, indeed, to earn more than just two rare prize cards for all your tasty wins) you'll have to retire from the Jumpstart event, and buy back in again, with another 2,000 gold or 40 gems
Another surprising point in their list is that the most expensive card with the ever-so-popular Charizard on it isnt actually its own card
High-Quality Japanese Artwork: Immerse yourself in the exquisite and detailed artwork that Japanese Pokmon TCG sets are renowned for
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The random creatures they get in each game keep it fresh and prevent it from relying on combos to win, and sometimes they just flip Kiki-Jiki, Mirror Breaker and Zealous Conscripts back-to-back and end the game