Lineup Advice

I need a little help on my lineup. My end goal is to have the “one of each” aura so I’m currently using (in this order) Queen, Iceblink, Demon Hunter, Walter, Gerke, and Amuvor. My only concern is that I don’t have a healer in my lineup, I’ve been trying to get a Vesa for about 3 months but I decided to 7* a Demon Hunter because it’s taking so long. I’ve also thought that it might be a problem that I don’t have a warrior, but I’m not sure.