First of all the new changes are interesting. I'm not into marksmen so much but I will definitely try out some of these. One Item caught my attention, Mortal Reminder which states "UNIQUE Passive - Executioner: Physical damage inflicts Grievous Wounds on enemy champions for 5 seconds."
Morellonomicon states "Dealing magic damage to an enemy champion below 40% health inflicts Grievous Wounds icon grievous wounds to them for 4 seconds."
My concern is that Mortal Reminder might be a bit too much considering that basic attacks are physical damage themselves. I haven't tested out the changes yet. But if that item procs even on 100% Health and on basic attacks, well... Healers are pretty much done for it.