What if Eve's passive was changed?
So, I'm basically talking about changing her passive to something similiar, but less strong in order to create a base for other buff.
Was is Eve's passive about? Eve's passive is about being stealthy and allowing her to setup ganks. In it's current form (/ignoring wards) it offers little counterplay and is really strong.
Suggestion: Remove the invisibility. Allow her to transform into (copy) target minion or monster for 20 seconds. Copying a minions does not replace it. Upon activation Eve looses all minion aggro.
Reason: The principle stays the same: Eve stays stealthy and can setup ganks. However - she has to take care to not give herself away. Enemies also have a good option of counterplay: keeping the amount of newly arring NPCs in mind.