ウラオモテをぐちゃぐちゃに混ぜても、おまじないをかけた瞬間、向きがそろい選んだカードが当たります。

Have the spectator select and memorize one card. After the card is returned, shuffle so some cards are facing up and some are facing down. However, if you cast a spell, the orientations of the cards will be aligned instantly, and only the card the spectator selected will be facin