I like the vibe from collecting new cards for your combat deck. The new card system for a hentai game feels different and that is good.
I also think there are a lot of balance changes required
Right now you can use your stam card once (draw 2+recover stam) and your best collected card. Makes you immortal and you always deal insane damage.
-> You MUST use all card slots and each one must be a unique card
-> Maybe give them a value and you have a max value pool. Higher quality cards are more expensive, forcing you to fill the other slots with lower quality choices