JML definitely needs a buff!!
He obviously needs a buff and here are the reasons: 1. He has less Mastery than the other 3 GLs. 2. On top of the previous point, he can't manipulate Mastery, either on his allies or the opponent'...
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They did make a statement they are looking at him too, but he does seem to be on par with the older GLs, despite the points you made.
