The creator of the Demons versus the new All for One
Muzan, so far as I recall, only had major fights after getting a serious nerf from poison. But it wouldn't be fair to have him literally be dying from word go. So for the sake of this match, assume that his physicals are capped to what we've actually seen from him, but otherwise he's not rapidly aging or anything of that nature.
Shigaraki has his All for One powers, of course.
Bonus: They sit and talk