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Fall of the House of Cards: Yugi's introduction in the first episode shows him making a house of cards on his desk, only for it to fall when a classmate interrupts him to invite him to play basketball over the lunch break

[8] Ray has a strong admiration, and an albeit fan-boyish personality towards Yuma, since he knew that Yuma won the World Duel Carnival, and even refers to Yuma as the "crown jewel" of Heartland Academy and Heartland City

You could have also picked up the Theme Deck Savage Stompdown, which had a Natural Order (notably not on the RL) in it

The card is numbered 3 of 31, meaning well probably have 31 different cards and some duplicates in the deck of 50

However, its known that one of the other prototypes has a Magic The Gathering card backing (another game produced by Wizards of the Coast), which is speculated to make it worth even more if it was ever put up for sale