About cards in hand, it's very strange because when I play a card that allow me to draw 4, I didn't go to 8 nor even 6 cards in hand.
By "reducing coin size" I mean : the yellow icon on the top right of each card. Because it kept our attention and it's not (in my opinion) so important.
Another thing, maybe you can add is an "play basic (cards)" button, because on most cases the order of theses cards doesn't matter so much.
And another cool stuff : adding attributes, skills, effects, on enemies (but for later in the development, icons on cards instead of text remains the 1st priority to have a fluid gameplay).
Tank you for listening to me :)