I’m not a fan of CC, but I actually like this idea. Especially if you could use the MC’d person’s ulti for your team. Would honestly be a game-changer and counterplay ult stacking.
The character would have to be super weak to compensate, though. Ie: If they die while “channeling” the MC, the MC breaks. MC would also need a crap ton of counterplay options. I personally like this suggestion:
Edit: Too bad this hero wasn’t Moira… “Surrender to my will!” would be the perfect voiceline for this ulti. 