I think Yuriko needs to be added to the ban list for Ranked Brawl, and I've got a list of reasons.

Yuriko ignores commander tax, which is one of the defining rules of the format. Yuriko is also uncounterable because Ninjitsu is not a cast, it's an activated ability. Yuriko also, has the potential for insane amounts of damage far too quickly for most decks to handle. Yuriko also provides card advantage on top of all this.

The only game I have beat Yuriko, I was able to literally kill every single creature they played.

I just hit mythic with Atraxa Grand Unifier, and speaking from experience, Yuriko was basically unbeatable every game I played against it.