ARBITRIUM combines a Double Prediction with Any Card At Any Number (ACAAN) into a compelling and easy-to-follow plot that baffles audiences.
The performer removes a mystery, odd-backed lucky card from his wallet and isolates it. Two decks are then introduced -- a number deck and a standard deck of cards. Both decks are spread for the spectator to choose ANY card from each (they really do touch any card from each deck!). Next, instead of a tedious counting procedure found in most ACAANs, the performer retrieves the isolated lucky card, which is then turned over to show that it's not only a perfect match to the freely selected card, but it also has the chosen number permanently written on it! An exact coincidence -- proving that it truly is a lucky card!
The description above is how the effect plays out every time (no "best case scenario")
Very practical method
Easy to do
Resets in under 10 seconds
Multiple versions taught, including variations with just one deck
Can be adapted to a variety of other creative ideas aside from cards and numbers (such as names, drawings, logos, colors, etc.)
Here are a few quotes from reviews over at The Magic Cafe:
"This is a very practical-to-perform, strong, deceptive effect, and it uses a nice marriage of principles to make it all work." - Matt "Mayavi" Packard
"Well structured and thought-out routine. An effect I predict that all, or at least most, will use if the ACAAN plot is your thing... It won't end up at the bottom of a magic drawer... Recommended!" - Rizzo
"If you have no issues with doing a one-time setup and carrying two decks specific for this effect, then this is a very interesting piece that is guaranteed to floor spectators." - ash2arani
Format: 50-minute instant video download
Note: There is a one-time, easy DIY construction to setup the decks for the effect, which uses materials that most magicians likely already have.