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Cards are most likely made with a different ink now than 20 years ago, which could be a contributing factor for the sun discolorations and the differences we see with your Base Set Poliwrath and EX Team Magma vs Team Aqua Walrein

I played the deck twice in a local league and never felt very good about it

Mind Trust X SPELL Tribute 1 Level 2 or higher monster

The card depicts Pikachu holding a massive trophy

While Wizards has mentioned increasing the drop rate of the Universes Beyond reprints, unless they are willing to massively increase the drop rate (which seems unlikely, because if everyone knows they can easily get Magic versions of Universes Beyond Secret Lair cards in a few months they might be less likely to buy the Secret Lair drops, and Lairs are hugely profitable for Wizards and Hasbro ), it doesn't seem likely that The List "reprints" will be enough to solve the supply issues that could arise if one of the exclusive cards becomes a format staple

And, if you time it well, splitting the trial across late November and early December, you should be able to get the Pikachu, too