My team:
Leader: Captain Phasma, the extra attacks are very nice
Darth Sideous, the Heal Immunity his basic attacks do is often a game changer. Like when some of them is down a lot and is Heal Immune, the opposing team wastes their heal abilities doing nothing
Luminara: excellent healer and also high damage
Jedi Consular, also for the healing.
Old Daka: In some way the most Important character because she can raise the dead, heal, and her basic attack stuns.
They are all about lvl 68-70, Luminara, Sid, JC is 7*, Phasma and Old Daka 5*.
My strategy:
First kill Darth Sideous if it's present, getting Heal Immunity yourself is sometimes really annoying
Second: Kill Old Daka, so she can't raise the dead.
The rest kill them in order of damage they can do to you.
Whenever some of your characters die, use Old Daka's resurrection ability. If it fails, RETREAT!
That way I sometimes win the entire GW with a single 5 character team.
It can be really tedious but if you persist you usually succeed. Just keep trying and trying until you beat a level without losing a single team member. There are times when you are against an extremely strong team, like all maxed out characters. In that case I usually swap my entire team with other characters and let them fight to death, weakening the other team and then finish it with my base team. This of course doesn't always work but this strategy is pretty good for me at least.
