how to know if a one piece card is rare The TCG Help identifying a card :

If a double-faced card is cloaked, it will be put onto the battlefield face down

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*The world rule from the Comprehensive Rules 420.5i If two or more permanents have the supertype world, all except the one that has been a permanent with the world supertype in play for the shortest amount of time are put into their owners graveyards

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