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It doesn't interact with the Sky Island kit directly, but it fills your hand, which is perfect in this strategy

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The Hidden City helps this deck massively by allowing one to search a Subterror monster from the deck on activation

Set 1 "Super Polymerization" directly from your Deck, also until the end of your opponent's turn, you can Fusion Summon Fusion monsters that must be Special Summoned with "Dark Fusion" with effects other than "Dark Fusion" and you cannot Special Summon monsters, except "HERO" monsters

But pump enough mana into it, and no one will be able to ignore it