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Mewtwo V-Union (Sword and Shield Promo): This is not exactly a tech card since it forces you to build your deck in an entirely different way but if you are able to set up a Mewtwo V-UNION, you should have a very favored matchup against Lost Box all of the sudden

Furthermore, it still sees play in some formats today, as it can make powerful XYZ boss monsters like "Toadally Awesome"

Xyz Monster cards don't have level stars

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