YACAAN -- yet another card at any number...  But a very good one, which can have a very impromptu feel to it.   Rus Andrews has taken a very natural and easy means of selecting the number (first used, I think, by genius mentalist/cardman, Max Maven/Phil Goldstein) and he has incorporated it into a straight-forward super-clean prediction of a card.

It looks like this.  Magi-mentalist gives the spectator a prediction to hold.  (The props include a cool black envelope and blue backed playing card, but for a more "impromptu" feel, you could scribble a prediction on a piece of paper.)   The spectator safe guards the prediction -- you will never touch it again.   A cased deck of cards is set on the table.  (You will not touch this again either.)  Now the spectator is asked to put her hands behind her back, and to extend some fingers on each hand.  This is absolutely her own choice, no forces or equivoque.   She brings her hands out and has extended, for example, two fingers on one had, and four on the other.   She then has a free choice of whether she wants that to represent 24 (two and four), or 42 (four and two).   She goes with 24.   You step back, and ask her to remove the deck from the case, and to deal down 24 cards -- turning each card faceup as she goes.  They are seen to be well mixed and different.    She stops on the 24th card -- the 9 of clubs.    She removes the prediction from its safe place, and looks at it.  It is the 9 of clubs.

The number is freely chosen, so it is not the same every time.   Rus Andrews has figured out a way to make this work every time, with no unnatural moves or tricky maneuvers.  As I mentioned, it is basically a hands-off miracle, so you know it must be easy.  All your effort can go into building the presentation.