One of my favorites that I fell in love with was a particular class on an MMO game called Rift. It was the chloromancer. In practice it was tricky and arguable how effective it is but it was a healer class that provided raid/group heals by doing damage. Your damage attacks would provide the heals.

Just a neat concept I immediately fell in love with.

Neat little project and reading a few messages offer some hope. The vast majority of them were super positive.