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All monsters get their card cost from a formula

[7] Yuamu offered new information to Sky for information on Yuna, but Sky revealed several secrets, including Yudias' ineptitude with yakisoba and that they had been watching UTS due to taking an interest in Yudias after Zuwijo Despite this Yuamu still believed she had info for Sky and challenged them to a Rush Duel, but to Yudias' shock, Sky's info included Yuamu's Deck, countering her High Tech Dragons with anti-LIGHT tactics to avoid the effect of "Blue-Fang Burst Dragon"

It showed just a taste of how powerful Mewtwo was

PSA is such a big name in grading, in fact, that during the 2021 trading card frenzy (right around the time that Target temporarily stopped selling Pokmon cards after a few reported incidents of violent in-store disputes), the company had to stop services entirely to catch up to their 10 million card backlog

Players can learn more about their card decks with Ravensburgers Disney Lorcana Collectors Guides, which currently cover card Sets 1-4 and 5-8