How would you rework LoL if you could?
For me, I would change how Items work.
No more Items that just boost stats and therefore all Items would either change how a hero plays (reduce Cooldown, adds slow or DoT to spells, damage reflection etc...) or give active effects that can affect the game.
That way builds would be chosen on which bonus ability benefits your team the most and not "just get the same 6 Items every game for max cost efficient build".
That way every Champion could be build around his niece and get Items to either improve his strenght or cover for his weak spots, and we wouldnt have to worry about champions getting out of controle with scaling.
as a sustain item that obliterates minions and monsters with a passive that can be lifestealed from while granting vision and being a useful item to any AD champion that uses autos more than they cast spells. There would be an inverse for AP Spellcasters, though.
, and Ranger's Trailblazer.
would recieve a minor rework so as to not make it an item that is only used by 
would be useful. Don't know how yet, but it would be.
and
would have their recipes and stat profiles reverted to being pure defensive items, and Abyssal Scepter would come back in place of Banshee's for mages.
would be on Summoner's Rift with its passive working similarly to Tiger Stance.
would be the AP (or at least On-Hit?) version of
.
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would get her AD build back (Why did this go away, exactly? I liked being able to go Hybrid or Full AD or Attack Speed instead of Full AP)