(.7% + .1%*X) for every stack. X is the champs level. so it gives 8% to 25% with 10 stacks depending on level
That will make it better on most melee then ranged and scale as the game goes on.
And the only item boosting this keystone will be 
Wonderlands1 votesWhat about on-hit champions like 
darkdill1 votesCan't really pander to them, and Teemo can go Deathfire Touch. So annoying on his mines.
Irelia Bot1 voteskayle will get the same kind of damage boost and others like her would.
Teemo... why are you wanting this mastery on him when he already has thunderlords and deathfire to pick from to great effect?
PulsarPollo1 votesI agree with it, but if the stack growth was raised and the base percentage was maybe half a percentage lower then it would be perfect for scaling champs.
Irelia Bot1 votesLe us say a level 3 champ with 65 base AD gets to 10 stacks
That would be 1% for every stack and top out at 6.5 bonus AD offered from this mastery.
That is not overwhelming.
I am not trying to kill the mastery but instead make it better a little better melee then ranged by using a stat that melee usually have a greater amount of and also make ranged have a harder time in top lane.
Varnoc1 votesExtending your line of thought, this would give Juggernauts a good reason to dive into the ferocity tree, due to their higher base AD and tendency to drag out fights.
Not saying it's a bad or good thing, simply an observation.
Malicious Metal1 votesWell, 146 base ad being increased by both fervor and Steraks would give Morde 438 damage sheen procs
Irelia Bot1 votesit is bonus add added on not base AD.
Phoenix Kotori 1 votes[{quoted}](name=Irelia Bot,realm=NA,application-id=3ErqAdtq,discussion-id=k6yrRbFA,comment-id=,timestamp=2016-10-21T03:12:32.847+0000)
(.7% + .1%*X) for every stack. X is the champs level. so it gives 8% to 25% with 10 stacks depending on level
That will make it better on most melee then ranged and scale as the game goes on.
And the only item boosting this keystone will be
Or we could not since melee already get stacks twice as fast which matters since stacks fall off faster now (4 seconds vs 6 seconds on live) plus 10 stacks max, and spells gain stacks more limited than before.
And will frankly make the keystone awful overall and likely would kill it's usage overall, currently it will give 10-60 AD on at 10 stacks, even 
would only get 4.88-36.5 AD from max stacks? Why is your suggested value so much dramatically lower compared to the 10-60 currently suggested on PBE?
If you want to use % so it doesn't hurt the average melee who might use it vs the 60 current, you'd need to DOUBLE your suggested values make it scale from about 16% to 50% with 10 stacks depending on level so that the average melee would still get roughly 10-60 AD (why ranged would get a bit less).