To improve the accuracy of the card shooter and possibly the power as well, you could add a barrel through which the card could be propelled. This would allow for a greater velocity in the intended direction (improves accuracy maybe?). You could position the card either vertically or horizontally. I feel like vertically you would get a greater spin, but horizontally it would travel faster. PS: I just thought of another way to make it spin instead of the band pushing it into a spin. If you put a nub in the barrel and raised the top of the barrel to allow it to spin in the barrel, it would be perfectly straight as it exited barrel and you wouldn't need to worry about the band giving it enough spin after it exited! PPS: Also, if you stopped the pushing mechanism attached to the bands before it reaches the nub then you wouldn't need to worry about the pusher wedging the card between the it and the nub. Please comment on your thoughts guys!!