I first played this game b4 HoC updated to have Grail Knights so I like how you can expand the card limit but now you have to level up to a certain level to get more cards and its a grind because I have some good cards/characters but I can't do anything like evolve or level up my cards I have now. It would be better if you switched out the card expansion for the cards not in the vault. In simpler form keep vault and throw out GK card expansion system.