I’ve just shown screenshots of Myztero throwing back mana generation slow from Telly, burn from Gravemaker, poison from Clarissa. Before, I’ve shown how he throw back Morgana’s ailment. On top of those, he deals 107% dmg. Isn’t it enough?
Yes, he needs support from the team to do that, that’s why Rigard and Brynhild are with him. It doesn’t work every time, but he would be ridiculously over powered if it worked every time. Make a team around him. Don’t expect from him to do all the job.