Untargetability is the most unintuitive, unfun, uninteractive mechanic in league, Change My Mind
Untargetability is the most unfun, unintuitive, uninteractive mechanic. It rips control from the victims hands in a bad way, and the only justification is "outplay".
Its easily accessible and has next to no cooldown for those who play against it. Its taken for granted by the people who use it and to those playing against it its loathed.
This includes

But however does not include

or others where its extremely minor, has counterplay, or is not in their control.
It takes no skill to use, no mechanics, no planning, and yet is still massively efficient. Change my Mind.
= Snared upon deactivation
= Well timed charm upon deactivation.