I've noticed some fliers have boosting skills that only help other fliers. Would that make three- or four-flier teams useful?
How are you guys building your teams? Is a healer a must-have? I've played without a healer before, and it always feels dicey because then you're just trying to kill them before you die yourself.
I'm not using a healer, and neither is pretty much anyone else I faced in arena. They just don't seem all that useful. They get maybe one heal off before dying and do basically no damage. I don't remember healers ever causing me problems in arena.