Keystone Masteries
I remember a time in league where you played your champion and got kills and objectives based off your skill. Now is not that time. Where I press "Death Recap" and 600 of damage is thunderlords, a mastery that is available to everybody and isn't even part of the actual game. When I go to trade against a ranged champ as a melee, I win the trade by 75 damage, and then their 3rd auto attack comes over to me and takes down half my current hp, winning the trade in their favor. Where a tank with 70 hp can go into a bush, turn around and auto attack, using Grasp of the Undying, now the 400 armor Amumu is at 400 hp and kills you. I remember a time where there wasnt such thing as Sated Devourer or Duskblade, that gives you free damage just by right clicking once.
IMO Keystones makes the game completely stupid. No out-of-game ANYTHING should be giving you 200-300 extra damage for doing absolutely nothing. I like playing high-skill champions which rely upon outplaying the enemy. I can't really outplay somebody right clicking me while I dodge all their abilities. There is no counterplay to it other than to not go for cs. The game was better off without Keystones.