When I get 250, I could make my first RoU.

What's a RoU?

The Roulette of Unluckiness, or simply RoU, is a roulette of basically a wheel of an amount of names with one containing a curse (Example: Change my pfp to an anime girl, furry, kpop member, etc. till reaching X amount of exp or songs or until X date) Each "No curse" will divide the amount of names in the wheel by a prime number. If the wheel chooses a curse, it's over and I should do that curse or else I will need to quit NG for a week.

How common would it be?

Basically starting with every 50 songs gained.

Where will you do that?

Basically here.