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At the end of your Battle Phase, if all monsters you control are Valkyrie monsters (min 1): Send this card to the GY, also, immediately after this effect resolves, skip to the start of the Battle Phase of your next turn

As such, they can often also be fairly weak cards, such as this example where Cinderella only has an attack power of one, and a defense of two

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The cards are: Sorcerous Spyglass (As Sorcerous Spyglass enters the battlefield, look at an opponent's hand, then choose any card name

Like Fusion Monsters, some Synchro Monsters need specific materials, other can use more general materials