This is a great tool that'll help make iterating on card-based designs much easier. It's also semi-responsive, which'll make using this on a mobile device for testing in person (when that becomes safe to do again) much easier as well.
A few things I'd love to see if you decide to continue further on this:
1. It would be great if the text value entered in the spreadsheet cells was included on the drawn card (eliminating the need to cross reference.)
2. A way to import your own text file with values so you can "save" your oracle.
3. Full responsive support; it's a little small on mobile and some of the table columns get pushed off the screen.