Hi,
I would like to suggest separating owned cards and deck progress between Deck I and Deck II.
For Deck II, it would be very helpful if the percentage showed progress based only on cards owned or reworked specifically for that deck, instead of mixing all cards together.
Right now it's hard to understand real progress toward Deck II, and this change would give players a much clearer sense of advancement.
Also, I want to bring up the issue of disenchanting and required kills per mob for green or blue cards.
Some green cards require the same number of kills as other green cards, but the difference is that certain mobs exist in very small numbers on the map — sometimes only 1–2 mobs available.
Because of that, reaching level 5 stars on those cards takes significantly more time compared to others with the same requirement. The difficulty is not coming from challenge, but from low mob availability.
It would make the system feel much fairer if kill requirements were adjusted based on how common those mobs actually are.