Could there be a mastery that targeted towards consecutive mana usage?

I am talking about mana draining abilities that can be spammed (like E, Q, Q, and R) or are toggled AOEs (like W, R, E, and R) which tend to rely on having a fairly large mana pool. Currently there are only 2 items that deal with mana drain abilities, and better . But there are no masteries that specifically target mana drain besides just increasing the general mana regen by a slight amount ('Meditation' or 1.25% of your missing mana regenerates every 5 seconds or 12.5 mana for every 1000 mana missing, every 5 seconds).

In other words, often times these champions do not get a ton of use out of raw damage because of their scalings, either mana, damage or both, are low to compensate for the short cooldowns. So could a mastery be implemented to specifically target these champions? Maybe one that applies when you use the same ability with in a certain time limit (maybe under 5 seconds) and/or keeps a toggled, mana draining ability on for 3+ seconds you get 5% of the damage dealt (after the initial 3 seconds for the toggled ability) back as mana. If this is too strong, then simply either lower the mana gain percentage or make it apply to only champions and jungle monsters instead of just all non-structure targets.