John Bannon's first effect in the Fractal Card Magic Trilogy.
The magician displays several Aces of Spades with the same back design. Explaining how he practices with all the same card, he shows that adding a face-up card can cause the whole pack to turn face up, and vice-versa.
While moves are nice, he shows that while moves misdirect you, he took the opportunity to switch in several cards with various back designs. Of course, in order to win money, several other cards change to a Royal Flush in spades. Ends absolutely clean and examinable!
Bannon's brilliant handling is explained fully on the enclosed DVD, which includes a downloadable e-book in PDF format. Gaffed cards included.