In my opinion, when it comes to League there's nothing like a good sustain champion. While many may disagree with this statement I find a thrill in the concept of the "kill by a thousand cuts". Almost all champions that I play have this as their core concept... or at least a side-note aspect. Mid lane is my favorite and often leaves me ambiguous to contribute once the team-fighting phase kicks in, for the thrill of the hunt is like none other.