The best day of my life as a shaman was getting healstick 2hb because it allowed me to take a breath of air and actually cast something that wasn't a heal finally.
Might also be cool to just have some tome where self inflicted damage on shamans (thru whatever means, canni, weapon proc, feedback / recourse, etc) returns a portion of the damage as a group heal, and just lean into the mechanic wholesale for purposes of itemization (verdict?) and spells. Could also even reduce self harm damage slightly as well on shamans so they dont just obliterate themselves after gearing to the teeth with the "kill yourself" items.maybe shamans can get some low mana cost, quicker cast, low recast time gheals balanced around using their own hp as a resource.
Clr/drus get gheals at 19, 29, 44 and 63.
Shams could get "Blood Mesh" at 19, 34 (greater), 49 (superior), and a 63 version "Blood Swathe."
63 could be like 3.5 sec cast, 1100hp burn, 800hp gheal with lower level versions values adjusted appropriately.