Hide the amount of cards a player has at any given time in the game. Most games come down to cards...Why should all the players be able to see how many cards you have? This is especially true in fog of war games (I recently knew when to make a kill based on how many cards my opponent had) I think it would make the game so much more realistic and fun if you couldn't see how many cards another player had. It would add a whole new twist on the "waiting to cash deal"
Now yes obviously some douches are gonna say that you will be able to go back and track manually through attacks how many each players has but lets be realistic players will seldom have time or the commitment to do so...if they do props to them...it would make them work for it atleast.
I think cards should be hidden...Especially in FOG games.
This will make game play much more strategic.