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As Monster Reborn, all five pieces of Exodia were Ultra Rare cards released in 2002 as part of the collection Legend of Blue-Eyes White Dragon

It's not yet enough for a Firewall-specific deck, but the cards synergize well with other Cyberse-type monsters

8 Solemn Judgment Stops Any Summon, Spell, or Trap Metal Raiders Jun

Emperor Charles the Great is a unique Link monster - typically, Link 1's are the weakest

It takes a little while to transform Sidequest: Hunt the Mark into Yiazmat, Ultimate Mark, but you do get a removal spell up front, and it costs nothing to get your free Treasures

Another factor was the increasing complexity of the game itself