Leon initially agrees because he is unaware of his brother's plan believing that winning at Kaiba's own tournament and humiliating him will be enough
Cards are typically numbered in a specific order within a set: Grass-type Pokemon Fire-type Pokemon Water-type Pokemon Lightning-type Pokemon Psychic-type Pokemon Fighting-type Pokemon Darkness-type Pokemon Metal-type Pokemon Dragon-type Pokemon Colorless-type Pokemon Trainer cards (Items, Tools, Supporters, Stadiums) Energy cards Secret Rares: Numbers Above the Set Count This is one of the most useful things the collector number tells you
Thickness (microns): Dragon Shield Perfect Fit Sealable (75), KMC Hyper Phoenix (130) 100 Double Sleeved Card Thickness (mm): Theoretical (71), Practical (75) Water Test: Pass Deck Box Fit (mm storage): Fit: 100 good
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I only play Yu-Gi-Oh
Kjeldor has previously been established to be a kingdom with a lot of knights mounted on giant birds, so it's actually a cute little flavour that they've got regular-sized birds as well