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You can choose cards with "Crystal Beast" in their names and cards with "Advanced Crystal Beast", treated as the same name in their name in your hand or on the field and interchange them. When a monster with "Crystal Beast" or "Advanced Crystal Beast" in its card name is destroyed as a result of battle, you can reduce the battle damage inflicted to the controller of this card to 0 by sending 1 card with "Crystal Beast" from your deck to the Graveyard. When a card with "Rainbow Dragon" in its name attacks, negate your opponent's monster's effects. This card cannot be destroyed by a card effect.