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blaine is performing for a group of prisons. he tells one to think of a card, and then gets the spec to select a card from blaine's deck. blaine then says thats your card. the spec declares it isn't. the card that the spec is holding is the queen of clubs. blaine stands there for a moment and then asks if it is possible if the lady could be holdin his card. he looks and guessing by his reaction it was his card. the four of diamonds.
the spec never says it out loud, writes it down, tells a friend or anything.

does anybody have any idea what this trick is called or were i could purchase it?
it's a great effect and i wouldn't be surprised if it wasn't on sale. but any help would be cool.
thanks

you can buy this trick.. i think.. its most likely called ''stooge''.. you can probably buy it for a couple of quid or a cheesburger in some cases

Take a look at the Gaff deck and DVD over at ellusionist. It might not have that effect exactly but their are a number of other similar possibilities available with that deck.