My current team is:
Rex (L), EP, Zylo, Shoretrooper, Nihilus.
Shoretropper is really good vs. debuffers, since he gets his cooldown reduced by 1 turn for every buff he has, and usually he has at least 2 buffs, so he'll be ready to heal/taunt straight away. Nihilus is fundamental to block abilities, debuff, and insta-kill. Zylo is useful for stunning, more than other. His Zeta improves his durability, but's not a must have (for this particular team). EP prevents rebuff and stuns, and finally Rex is Rex.