Nicely done!
Have different die that 'roll' to deal damage/effects against cards (that also fit into the theme cause their association with gambling/luck) was a very good take on the theme and implemented pretty well too! I appreciated that each die wasn't just damage based but had its own skills, the percent chance for each being based off its die though. Nice!
My only critic of the game is the UI, if there was a faster way to navigate the UI or interact with the game, that would have been fantastic! But I understand it's a 48 hour jam and that your primary focus was on game play (which I agree with). If you decide to keep working on it, I would definitely start with the UI/Art. I would also pick a song that looped a little bit better.
Overall though, very impressive! Way to get in different AI behavior too!