so you'd wanna take advantage of the crits and use peeps that do a lot of criticals....... Here is a squad I came up with:
Ig-88 leader obviously, with 20% crit chance.
Gam guard for his DoT and Tanking
Princess Leia she can do tons of crits and she can hit up to 3 times, kind of a no brainer here because she also gives crit chance up to the team, plus shes now farmabable in arena so you should be able to get her easily.
Phasma Turn meter and Advantage should be great here especially when pairing advantage with AoE attacks. Her defense down will help as well.
now this last slot can be filled with anyone.... Vader for killer DPS (which will probably be your best bet here) or possibly a healer to keep the Gam Guard alive, that's up to you guys though. an option here would be talia as she does more damage against enemies suffering DoT.