This is a cool combo of the Valentine Diminishing Card and Shrinky dink.

Because Shrinky Dink starts on the half sized card, the extra diminish can be super small which is super fun.

Also consider ending this by pulling the Grower from the upper right inside jacket pocket, as in the original demo in the Magic Castle Lecture (here on Magic On the Go) .

Fast and visual, easy to get into (thanks to the VDC) this is ideal for your Cards to Pocket finale.