A deck of cards is shown to the spectator, which is half red-backed and half blue-backed.

The spectator is given half and asked to shuffle them and select 1 card. This is shuffled into the magicians cards. The magician does the same, giving the spectator a card to shuffle into their cards.

Both of the packets of cards are spread out on a table to reveal that each has a card with a different back within it. These are both removed and they match!

As a killer final ending, both of the packets of cards are turned over to reveal that all of the other cards are completely blank!

As if that's not enough, the spectator can then totally examine the entire deck!

This fantastic effect is easy to perform and mindblowing.