Six cards are placed face-down on the table. A spectator freely chooses any card.
When he turns his card over, it has a red dot on it. The remaining cards are all blue.
The feat is repeated. This time the spectator selects a blue card.
The other five are shown to be red! It does not matter which card is selected, it is always the odd one out.

A sleightless miracle printed on Royal playing card stock
Made in USA by Royal