I think that they should give 10 crowns a week and you have to sign in that week to get them it doesn't real affect nothing unless you keep saving up it would be a great way to get people to continue playing.
Also if they was to add a card to be learned at the balance hidden schools that when used will give you 60 mana and takes no pips but only to can be put into a deck.
Also for the arena there should be a draw button that is about like the trade button it has to be accepted by both teams before completed for when both teams are out of cards and have to do nothing but pass.