In the manga, a big chunk of Duke's motivation came from his dad (the actual Big Bad of the arc) being an old rival of Yugi's grandpa, which Rebecca took over in the anime
Lets look at this list
0002_MTGTLA_BBTheme: Aang Tutorial Theme Card 8 Plains Aardvark Sloth Razor Rings Path to Redemption Appa, Aang's Companion Sledding Otter-Penguin Aang, Air Nomad Katara, Heroic Healer Momo, Rambunctious Rascal Aang's Defense Sokka, Wolf Coves Protector Tundra Wall Wolf Cove Villager 0008_MTGTLA_BBTheme: Zuko Tutorial Theme Card Dragon Moose Explosive Shot Run Amok Fire Nation's Conquest Komodo Rhino Zuko, Avatar Hunter Zhao, the Seething Flame Iroh, Firebending Instructor Zuko's Offense Fire Nation Soldier 8 Mountain Capital Guard Warship Scout 0001_MTGTLA_BBTheme: Allies Theme Card Kyoshi Warrior Guard Jeong Jeongs Deserters Glider Kids Avatar Enthusiasts Allied Teamwork Aang, the Last Airbender Suki, Kyoshi Warrior Rabaroo Troop Master Piandao Mechanical Glider Path to Redemption Airbending Lesson Thriving Heath 7 Plains 0004_MTGTLA_BBTheme: Waterbending Theme Card Flying Dolphin-Fish Otter-Penguin Katara, Bending Prodigy Sokka, Lateral Strategist Cat-Owl Flexible Waterbender Giant Koi The Terror of Serpent's Pass Watery Grasp Bender's Waterskin Deny Entry Waterbending Lesson Thriving Isle 7 Island 0003_MTGTLA_BBTheme: Spells Theme Card First-Time Flyer Master Pakku Rowdy Snowballers Iguana Parrot Turtle-Seals Geyser Leaper Serpent of the Pass Barrels of Blasting Jelly Abandon Attachments It'll Quench Ya
It appears Best Buy's invitation system was developed specifically in response to the overwhelming demand for Pokemon TCG products, as it's not currently used for any other items on their website
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The Deck Zone is capable of automatically shuffling the Deck and ejecting cards that have been searched from the Deck while the cards are locked in
