User blog comment:Havenhaven/Mr.Mxyzptlk vs Chaos/@comment-11490248-20130711064603/@comment-4867780-20130711083920

I was said many times over, there's simply not enough relevant materials to accurately gauge their power-level, especially for Chaos. All we can do is go by guess based on what we have.

Personally, the limitlessness of Chaos' power is pretty much acertained, considering his overwhelming superiority to genies who are quite close themselves.

As for Mxy, he seems no less except for this unexplainable and obviously plot-induced loss against alternate reality Zatanna.