I always perform the ambitious card routine, but I always wanted to make a highly visual and impactful color change, in a simple way, without suspicious gimmicks. At first I used the Wow gimmick, magnets, elastics, complex technique, but the sacrifice doesn't always bring a reward.
UpSlow! It is the solution to this effect; a freely chosen and signed card slowly and visually appears at the top of the deck, without complex movements, only with a gimmick that you can build in 30 seconds.
I have performed this effect for a long time and always have very good reactions.
Also, there's a bonus using the same gimmick!! you can locate immediately a signed free selection, in a deck mixed by the spectator himself!