Greg Rostami - Cosmos

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The main effect is designed to be performed to at least two spectators.

There is talk of a recent scientific paper that shows that under competitive situations the human subconscious has the ability to absorb far more than was previously thought possibly.

A deck of cards is borrowed， and given several shuffles by the magician. The two spectators are then asked to take out one black card and one red card each as these cards are to be used as markers.

The two marker cards are placed in front of each spectator， and the cards are shuffled again (in the fairest of "test condition" ways) and are shown to be completely mixed up.

The magician explains that this is a competition， the idea being for each spectator to guess whether a dealt card is black or red and to place the card face down against their appropriate black or red marker card. The spectators can choose to stop at any point and the remaining cards can be seen to be completely mixed， whereas when the spectators cards are turned over it will be seen that they BOTH guessed with 100% accuracy.

To say that this effect (and indeed any OOTW effect) is one of the strongest card tricks that can ever be performed， is an understatement of tremendous magnitude. This effect IS a closer.