Gut blademasters

There is no counterplay against blademasters. Every single time someone manages to build them autowins the game. It is plain stupid. I have a gold renekton, kindred, varus, sion, etc, with perfect items, nothing matters, everything just dies in a nanosecond because the guy has a silver yasuo, a silver sivir, silver nocturne with a silver khazix. They literally onesthot eveything, even gold, full build tanks. Blademasters with assassins has no counterplay, they need to be nerfed to the ground. Until that point this game is just unplayable.

Edit: Just to be clear: my issue is not the blademaster trait alone but how assassins can abuse it. Assassins are overtoned and needs to be nerfed. Giving them blademaster trait is simply BS and shouldn't be a thing.