The same way you deal with assassins?
Abuse their targeting algorithms to decide who they're going to target.
If I see MF or Cho, I'm gonna place someone tanky near them and everyone else away from them. They'll target that person.
Similarly with assassins, you set a tank as far away from them as possible and the assassins will target them instead.
Every unit and every ability has some way of targeting, and there are proper tactics you can take to counter them. I'm trash at and dislike the mode, but even I know how to use a freaking decoy.