They Say
A single red-backed prediction card is placed face-down in full view of the audience. The spectator names any number between 1 and 52 (e.g.17). The performer hands him a blue backed deck and asks him to have a look through it to confirm that it is simply a regular deck of cards - the spectator confirms that it is. He is then instructed to deal down to the seventeenth card and place it next to the prediction. Without any moves or switches, the performer turns over both the selection and the prediction - they match!
No sleight-of-hand? No equivoque? No switches? No extra props? No problem!
Mike Rose's brilliant approach to the 'card at any number' plot satisfies the need for a worker's solution to this commercial effect. This is so clean and direct that it will go straight into your act!
Cost
About £20, I bought it here (thanks

Difficulty
(1 = an aardvark could do it, 2 = a smart aardvark could do it, 3 = only the best aardvarks could do it, 4 = no aardvarks could ever do it, 5 = not even the God of the aardvarks could do it)
1.5, and that's pushing it. There's a little (very little) memory work, which is intuitive. The one "move" is so easy an aardvark could do it

Review
This is great. Really, great! The effect is just as it is described. It really is a free choice, any number between 1 and 52 can be named. The prediction is not switched, the same card is used. There is only one little problem - it does use a gaff. If you have a switching device, the problem is solved, but without that the effect is not examinable at the end.
Now that that criticism is gotten over, are there any other problems? Nope. Not one thing that I can complain about. This effect is just so clean and direct, I will...uh...do something

The perfect testimonial to the brilliance of THE GRAIL is that it fooled my brother completely, and that's hard to do seeing as he has become so learned in the magical ways (erm...) that I barely show him anything - it's not worth it.
Overall
10 out of 10 - easy!