Alex Elmsley's Dazzle is probably the greatest packet trick of all time.
Five red-backed jokers are shown. One of them is set aside, and replaced with a blue-backed joker. The other red-backed jokers magically change color to match the blue stranger. One of the blue-backed jokers is removed and replaced with an orange-backed joker; the other jokers in the packet turn orange as well. This process is continued, as the packet of jokers is caused to go through a bewildering number of color changes, from orange to yellow to green, etc., finally culminating with a change to nothing but faces on all sides, leaving a packet of five double-faced jokers!
If you purchase this packet trick, we urge you to also watch Alex Elmsley's Lake Tahoe Sessions #1, to be fooled by Elmsley's performance.