Master Yi
Is the champion itself unbalanced? Maybe. But when he is Sated, has Rageblade, and has the two components to BORK and is able to deal 1340 true damage in 5 seconds to me as Mundo with 230 armor (Thornmail and Sunfire) there is something very very wrong. Mind you I had Spirit Visage and Merc Treads complete at this point in time for just over 140 MR to combat the magic damage that is also a part of Rageblade passive. Doesn't matter though because even though he only had 218 AD at fully stacked Rageblade he dealt over 1300 true damage to me. There is nothing ok about that. This Yi also had Deadman's Plate so he also had some defense to him so I couldn't stand my ground as over 3000 health Mundo or when we team fought he was able to survive while still dishing out absurd amounts of physical damage, magic damage, and true damage. Something needs to be done whether it's an item combination issue or the champion itself or all the above. It's incredibly frustrating and toxic to deal with.
or
as MR is pretty useless against Yi. They give health and that's it. Against bruiser yi as mundo,
+ may be
. Mundo cleave is what makes the difference, if you can't land your cleave you can't survive and with insane health regen survive long enough for a team mate to hill him.