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that is not how it works. you need to have the card they make when they fuse. for example, three blue eyes can be, as you put it, "polymerized" for the blue eyes ultimate dragon but you need to have the ultimate dragon card in your fusion deck already. if you didn't already know your fusion deck is put to the side during the game and you can only summon the monsters in it by fusing the monsters in it's text by some means. one more thing. all monsters that go in your fusion deck say fusion in bold above the monsters listed on it.

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16y ago

What else can I help you with?