Bring Back Grevious Wounds
This may not be a problem in Plat-Challenger, but it's making life extremely difficult for us Bronze/Silvers. With the introduction of Sated Devourer, on-hit healers like Xin Zhao or Master Yi are basically becoming freelo champions because they can dive into a fight then out-sustain every point of damage that comes their way. Morellonomicon is decent enough as an AP solution, but we really need Executioner's Calling or some other on-hit/AD-based Grevious Wounds again.
Plus, ripping it out of Tristana and Miss Fortune was a huge mistake too.