This is the typical setup of Azure-mei-mabui-tenten lineup:



It's a quite annoying lineup in arena where both poison/ignition plays a big role and this team can do both.
Here main have heal in both standard and mystery.

As for how this team works:
1) You acupunture/immobile tenten round 1, mabui heals her and then she goes, dealing AoE dmg which also does poison.
2) You acupunture mabui, she heals and tenten goes. You immobile mabui, main heals her and then she and tenten goes round 1.

On round 2, if you lose to mabui in terms of initiative, she c*e her mystery and generate enough chakra for mei to go. If you somehow manage to immobile/acupunture mei/mabui here, main can cast heal and then they will go as usual. Because of having 2 healer debuffs such as poison/ignition doesn't work well against this team, whereas this lineup can keep doing stackable poison damage.
In short, using cc on this team can be really tricky.

One easy counter can be to bring a manual barrier ninja and remove mei barrier round 1. but even then, things doesn't bemore to easier. Both tenten/mei and myetery that has 2 round cd. As long as main is alive team will keep doing poison damage. Ig mabui is alive then tenten-mei can have enough chakra for mystery.

Not everyone plays as MB to run RoW. if you are using other teams, how do you counter it? using which lineup?
Maybe a elaborate answer with steps will help quite a few people here, as this team is very very effective in arena where our stats are reduced.
Thank you. Waiting for some good answers.