Make a healer that buffs the DPS. Sounds like an Everquest Shaman? One of the favorite classes of many who played that game. Both for those that played the class and those that grouped with it.

Good question, I dunno why more companies don't make classes like that. Seriously, look at the game on its 20th year of development, 26th expansion, and 16 unique races and 16 unique classes and see what they did right.