Thinking a bit more about it, it will not be infinite if Offee's healing can't keep up with the counter dmg. She only gets a turn every fifth counter attack against STH, and with her 4 turn cooldown, she'll only be able to heal STH fully every 20th counter. Her basic also heals a bit, but it may not be enough.
It's possible that another healer could replace QGJ, but that healer would become useless for healing once there is healing immunity. So perhaps two healers and high tenacity on STH is the key.
Anyway, looking forward to experimenting with this, as soon as my chirpa gets his 6th star. :)
