The idea is good. I'll just add a little more info here ,more for bitcoin notes, not cards but still informative>
Here is some similar idea > http://www.bitnotes.org/
There are already a banknotes with chip on in. Here is the article > https://hackernoon.com/these-smart-banknotes-could-bring-crypto-to-the-masses-4be57bcca1c7
NOTE: The links are just for information, I do not promote anything!