A few ideas to change Vayne
So Vayne has been considered problematic for a long time, generally being one of the best ADCs for stomping SoloQ, and I had a few ideas how to balance her. Not going to list numbers, but just general mechanic changes.
The changes I propose are as follows:
Vayne's Tumble:Longer cooldown at early levels, and bonus damage on auto-attack only applies to champions.
Vayne's Silverbolts:Does not apply to minions and monsters.
Vayne's Condemn:Unchanged, but only does it's damage if an enemy is pinned to a wall.
Her ultimate is unchanged.
The idea behind the changed is to leave Vayne's damage the same, but hit her laning phase and pushing power, as those are her weakness opposed to other ADCs, to make them more apparent.
With a longer cooldown at early levels and not being able to last hit with it, Vayne will be forced to use it as a defensive cooldown exclusively early on, leaving large windows to be engaged on while it is down.
The W nerf will hit her pushing power to further center her as a more kill based ADC.
The E nerf is mostly to remove a bit of free power if a Vayne cannot position her E correctly.