My friend and I thought a huge improvement to the game would be to have the Damage and Mana tokens have different numbers on the front and back.

For the 1 tokens have a 2 on the back, for the 3 have a 5 on the back and for the 6 have a 10 on the back. This effectively doubles the amount of tokens without having to manufacture new ones. It would also make it easier to get the correct number to place on a card since there would be more combinations.