Usually the answer should be Mage, but Boomy looks really good this season to play double DPS.
What do you think about ?
Boomy/sub could be great but tbh anything is rough this season cause there is too much immunity and stuff usable in stun, meaning you can’t win except if you get absolute broken dmg.
You won’t get enough self healing yourself as boomie imo to survive long enough to win.
Did your healing dream die that fast? 
Is not is not 
I’m still playing Rdruid, but yes…double DD is funnier
Did you test your idea about climbing in SS being easier as healer though? ^^
I didn’t as DPS yet