I think the idea is good, but the video editing needs work. I'm not sure you should be doing strong black screen cut aways during the performance especially if you are trying to sell a trick. They are very distracting. Remember to sell me on the magic trick, not your fancy camera effects. I'm not even sure how to describe the camera like pho-woble in and out thing that you do a few times in the video, I'm just not a fan of that. I'm not sure if that's a good or bad thing, I'm just saying that it doesn't work for me on a personal level.
There is another element about this video that I know instinctively isn't working right for you but I'm having trouble drawing into words quite how to express it. The way you are handling the cards is way too "I'm going to try and show you a magic trick". It doesn't look natural. It comes off very mechanical. Almost like if you didn't hold the deck in that exact way you couldn't do the trick at all. I don't know how much time you've spent working on the details of this effect, but maybe spend a few hours just drilling the movements so you get butter smooth with them?
Like I said though, I think the premise for the trick is a good one. Not a fan of all extra fluff you do, the extra cuts, the dribble, etc... but the premise is good. I think if you spend a little time working with it you'll come out with something solid.
As an added afterthought, It could be the cold medication I'm on but I really had a hard time telling the color differences on the backs of the playing cards. I think it had something to do with the card back design. That or the medication is finally getting to me. Maybe try filming this with either red/blue bikes, OR ghost/black tiger. Something where the color contrast REALLY stands out. it would make it more visual.