As opposed to Starter Decks (with the exception of Duelist Toolbox , V for Victory , Space-Time Showdown , and Yuya ), Structure Decks may include multiple copies of the same card
For the actual Fire King engine, for me it's only just: x1 Fire King Island x1-2 Kozmo Delta Shuttle x1 Fire King Avatar Yaksha x1 Fire King Avatar Garunix x2-3 Terraforming Having multiple Islands can lead to opening multiples which do nothing at all most of the time
As does every type of hobby, it starts with some investment, like buying the right computer, the gaming systems, the games, etc
Some of the best best structure decks from Yu-Gi-Oh
Only 19 listings on TCGPlayer (and almost all are single copies) means that I think this is due for a correction fairly soon, especially if the deck keeps picking up steam