New Quests content? GREAT!!!!
Customised Marks? I'm scared. It could considerably de-balance the game if handed badly. It seems like rock-paper-scissors. Maybe 50% electrum gained bonus or Rare Card reward would be better.
Neverthless I think the game needs more cards. There tons of brilliant ideas in Armory such as Psionist, Rejuvenation, Harpy, Vines or Slow