Chalice of Harmony's passive makes no sense for the champions that use it.

I remember when Riot changed it to it's current passive, they wanted to "simplify" the previous iteration, and the previous iteration was billed as an item that supposedly gives enchanters enough regen that can use their heals/shields more on their allies than themselves. The problem with the item is that it scales off of your BASE regen, and most enchanters have base regen that range from "pretty bad" to "completely terrible". Ultimately the result is a passive that just fucking sucks on enchanters and would be much stronger on tanks, who as a class have significantly higher base regen, if it built into anything they wanted. As it stands the only champions that even get decent value out of the passive are Bard and Ivern.