I really would like the deck editor to be able to be classified by card rarity, numbers of cards we own and probably more parameters. When you have 6-7 pages for each race it starts to be very difficult and boring to find the cards you want.
I really like the class and its sub-abilities system, but I believe it would be more interesting if multi classing had more impact on the hero. Leveling up different classes should either improve general stats, or creating unique abilities that can only be unlocked if your character is 16 knight 12 cleric 16 adventurer for example. I really like class based gameplays, but I think this one could get a little boost.
 "Card Monsters"){kind=icon}
 "The King's League: Odyssey"){kind=icon}
 "Rise of Mythos"){kind=icon}
 "The Grinns Tale"){kind=icon}