I have a process improvement for magic the gathering. Instead of have many cards restricted to 1 copy, why not have three levels of restriction? Three restricted (only 3 in main deck + sideboard), two restricted, and 1 restricted would benefit the game significantly.
A perfect example can be seen in the 2015 vintage championships. In 2014 and 2015 oath won. The oath deck has a good matchup for a huge percentage of the meta namely workshop, dredge, delver + other decks. In a decent match, it is likely that the oath player has two oath and a force of will in the opening hand. You must have two force of wills to prevent the first oath, and therefore probably no gas for the second. Oath is a bit imbalanced because it is very consistent and way too fast. However, if we 3 restrict oath of druids, it would be more balanced.