Deal an impossible second... From under a postage stamp!
Magic with a gambling theme. This routine incorporates two separate effects. In the first you claim to find the spectators card form a "marked" deck by wearing special virtual light specs. Oddly everyone but you can see the marked card plainly. When you remove the glasses it's too late - the mark has disappeared. You then demonstrate a second deal to find another card, but not any old second deal, and impossible one... from under a postage stamp.
A professional routine - 5 minutes of entertaining close up magic that's simple to do and has a remarkable, visual climax.