It is the ninth Deck in the OCG's Structure Deck R series, following Structure Deck R: Lord of Magician
Finally there's the fact that the Extra Monster Zone heavily damaged the Extra Deck mechanics arround these monsters, allowing "Pot of Riches" to work not only as a drawing effect but also to retrieve key monsters to gather together in future turns
With amber cards such as Dalmation Puppy, Tail Wagger costing two ink, that opens up the potential for Perdita to flood the board with low-cost cards that can keep your opponent in check by challenging their cards - or simply questing to accelerate your own lore count to victory
I don't believe Flash has ever been banned, but it's always been on the fringe as an offbeat Legacy strategy
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Card Errata Before [Your Turn][Once Per Turn] When you play a Digimon with [Four Great Dragons] in its traits, it gains gains for the turn