Would be cool. Except it wouldn't be very accurate. For example how would you solve for "over the current opponents life points" for spell card damages? If the enemy's HP is 1 and you have 6 fire lances with 75 quanta. So that would give you a total damage of 144 (6 X 8 X 3), which is 1,330% over the current opponents HP. But the thing is you can only use 1 fire lance since he'll be KO'd immediately. Hence it wouldn't give out said bonuses accurately. It would then be unfair for decks that specializes in using spell card damages.