I did this, half a year ago:
https://riptidelab.com/forum/threads/cbs.286/post-105532
Here is a photo of the result for those who do not want to click on the link
View attachment 5841
At first I was overly happy with the result. The tape/sticker was super thin and it looks semi-beautiful to me but also super ugly
Later on I have decided I do not like it even though my first instincts were positive.
The process of cutting the sticker and attaching it juuuuuuuust right was almost impossible for that one card. I can't imagine doing it 2000 times. I think it took about 10 minutes because I had to do several attempts before I came to this result. I might get better over time but I don't expect to ever go under 5 minutes/card. And the result is not amazing.
What do you think?
My remaining two options that I still find attractive:
1. Draw on the perfect sleeve with a sharpie. Maybe just a dot and then use different colors for different levels. This options is tier 2.
2. Design and buy custom sleeves. Obviously the best result but super expensive. This option is tier 1.