Pokémon Card★VS (Japanese, 2001)

The clearest case for importing: a 2001 set built entirely from the Pokémon of Kanto and Johto's Gym Leaders, Elite Four, Champion and Team Rocket, and never released in English. Wizards of the Coast passed on it, reportedly worried that the cards' high HP and strong attacks would break the game. Karen's Umbreon, pictured, is the card most collectors chase, with Lance's Charizard and Morty's Gengar close behind. Every Pokémon in the set is a Basic, even fully evolved ones, so these cards belong in a binder rather than a deck built around the English sets of the time.