Devourer and the Stacking Mechanic
Something I've found very unsatisfying is the stacking mechanic. Often times, I can't efficiently stack it because of the expensive cost of the enchantment. I get it usually at about seven minutes in, and I'm doing full clears with ganks before I back. I feel it would be more satisfying, if there was an item I could afford on my first back that I could start stacking. What I think would be a good idea is to bring back Madred's Razors and implement it into Wit's End as well. However, it would cap out until you upgraded it to either Wit's End or Devourer.
Think Seeker's Armguard, but on-hit magic damage.