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They are the "Ultra Beasts"

Because "Symphonic Warrior Guitaar" have Pendulum Scale of 7, it can be combined with the Supreme King Pendulum engine to fill the missing scale (with "Supreme King Gate Zero"), allowing the deck to Pendulum Summon more reliably

Oh, certainly, you can prey on less experienced players and new players

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Batwing Brume is another great pick, albeit much more niche