Fun fact: Vayne's W actually DOES have a counter.
The funny thing about Vayne's W is that it actually does have counterplay. There is actually a single mechanic that completely negates its effect.
Rapid health regeneration. Mundo, Fiora, Janna, etc.
The reason why we all hate Vayne's W so much is that there just simply isn't enough rapid health regen to counter it. To say it has no counter is silly. The problem is that its counter is barely ever applicable.
