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Unskilled, but Strong: Especially in the early days, Kaiba prefers to crush his opponents with brute strength and powerful monsters, and most of his supportive cards are meant to power up his monsters more or inhibit his opponent's ability to defend themselves

The further up the scale you go, the more I would generally expect stronger mana bases to show up because it matters more: cEDH (Bracket 5) decks will want the most efficient mana bases they can have, whereas mana bases for Exhibition (Bracket 1) decks matter less because games are slower and highly thematic

Absolutely, you do

Before Quarter Century secret rare cards took the spotlight in the Yu-Gi-Oh