New 3rd mastery idea for the resolve tree

As there are new masteries for ferocity and cunning tree (3rd on the second row) I came across an idea for the 3rd mastery on the resolve tree. I don't know if one has already been planned but here's my idea. Since the resolve tree is mainly about defence I thought about a that mastery that gave you 5 magic resist and 5 armor when you kill an enemy champion for 5 seconds. If you kill another champion within that 5 seconds the timer resets. I don't know if this would be any good but it's just an idea I came up with. :)
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