Two Card Mystery - by Masuda

Performer shows one side of two cards. Next, he shows the other side of them. Spectators realize one card is regular and the other card is blank on both sides. Magician casts a spell on the cards. As the blank card is rotated, the back design of the regular card visibly vanishes. Now both cards are blank on one side. The rear side of the cards is shown revealing the back design was magically printed on the blank card. Magician casts a spell on the cards again. As the top card is slid over the other one, the back design visibly appears on the back of the regular card. Both cards have returned to their original state. They can be handed out for examination.