If you could design a Mastery, what would it be?

Everytime I go to the mastery tab, I always see the “coming soon” mastery tabs that have been there for a quite a long time. So what if we add more rewarding/fun masteries? I would make a mastery connected to dexterity, and call it Far Distance, the description would be: Every time the player evades a projectile attack, gain a small Fury, increasing attack by +xxx for x second. And just like the title says, how would you make a mastery if you could?
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Comments
I would love to see next level suicides masteries 2 giving you more attack than the original Suicides.But these suicides should include coldsnap and incinerate damage giving you more attack.
SKILL:
Mystic Dispersion is so good for Mystic champions same way skill champions should be like this while hitting opponent there critical hits will reduce Abilitiy accuracy by 20%.
MUTANT:
Mutant champions regenrate 10 HP. Like labrynth OML.Regenration perfectly suits mutants.
TECH:
Tech champions will have increase power gain.
COSMIC:
Buff duration increase.
SCIENCE:
DEBUFFS gains 25% duration and potency.As they are known for debuffs.
Nothing overpowered masteries that fits these classes perfectly.Suicides are different case for sure.
Scales up to 10%
So basically, every defender with this mastery becomes BPCW but instead of reflecting stuns they reflect all the debuffs.
quake counter, away!