Riots balance team right now: "nothing is broken if everything is broken."

funny enough I was going to make a thread that edge of night should give stealth lol

Dota has a hero who has a large range AOE nuke that deals more damage the more enemy units are hit by it with no cap, and grants her movement speed, an equivalent to a 117% attack speed steroid for 5 seconds which heals her for 300 HP over the duration, and removes any form of cc (She can use it on allies), a 25% chance to counterattack with bonus lifesteal of upto 80% on being attacked, with the secondary attack applying all on hit effects, and a point and click taunt that that silences both her and you for 5 odd seconds forcing you two to attack each other. The winner of this gets upto 58 bonus damage permanently scaling infinitely. And she can purchase an item that prevents any outside interruption to this mini battle , and makes her magic immune while inside this effect. This champion has the 9th lowest winrate in Dota2.

EDIT: As pointed out by some of my Dota2 playing buddies, what is OP in one game may not be considered OP under a different set of rules and mechanics. For example, in Dota2, the very idea of manaless champions seems borderline broken, but in League, the idea of an item that deals 800 magic damage on a 16 second cooldown is absolutely ridiculous. However each game has ways to gate the power and efficacy of these items and / or champions/heroes. That's because the core mechanics of the game while being the same ( 5 characters, three lanes, towers, inhibs, Nashor/Roshan, Jungle , Ancient/Nexus) the underlying mechanics are startlingly different. RIght from the way supports acquire gold, to the accepted lane structure and beneficial statistics from items and their interaction with different champions and what not.