Yami Yugi only used about half 2/3 of his deck, meaning that it was more difficult to determine what he would choose to add (since he relied more on power cards)
Mystical Elf, Celtic Guard fit his theme of Warriors/Spellcasters; Skilled Dark Magician and Magician's Valkyrie would fit his deck (but I think they were only ever stated in the Pyriamid of Light Novelization)
Magic Formula, Dark Magic Attack, Dark Renewal are Dark Magician support he'd have in his deck
Mystic Box, Spellbinding Circle, Magical Hats, Magic Cylinder, Brain Control, Card of Destruction are iconic cards he has used before.
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