[GAMEMODE] Mark of the Victor (or something)

This is just a gamemode idea I had. Wanted to put it on paper.

MARK OF THE VICTOR: Dealing damage with an ability to an enemy champion or a large monster marks them. Dealing damage with another ability refreshes the cooldown of the ability used to mark the target. Once a cooldown is refreshed, the mark is popped and another one cannot be gained for 20 seconds.

Marks do not apply to ultimates (Veigar, Lux, sorry) and can only be popped by the champion that made the mark. Only one mark can be on a champion at the same time. Abilities that do not deal damage WILL NOT pop the mark.

What do you guys think? Could be the cause of some interesting combos.