Really fun game! I feel like it was hard to keep the deck size under control since there's not really a way to get rid of cards besides playing them and getting more cards (which I may or may not want).
A few QOL features that may improve this would be a deck view to see what you already have, a choice between X or Y for some cards (I didn't need nearly as many piers as I kept getting), or some way to destroy a card without playing it for a cost.