please, if you are going to enable ranked brawl, just don't allow planeswalkers as commanders.

In a 1v1 format having access to so many habilites as soon as it comes down it's unfair. there's removal for planeswalkers but it's not that common.
it's not like creatures with summoning sickness, if they caught you with no creatures on the table that means that the planeswalker get's free rein, and whatever creature you can put on the table to try and lower the points is going to either get blocked, destroyed or disabled. i'm not even talking about commanders like ugin that can even exile things on cast... not even as an hability.

I guess i'm not playing ranked brawl anymore