The game looks and sounds good. The gameplay loop is working.
The gameplay itself is a bit shallow though. It's important to have combos likae playing progressive magic and doubling a card effect, but all cards which interact with opponent's deck are just random (or I had to pay attention to card backs of ,y opponent, but this information didn't get to me).
Maybe having some jokers in hand for a conterspell or being able to chuse one of the few resolution of the card when it is played could make it better. Obviously it's a game jam and you didn't have much time so great job!