Supposedly the Beyonders ended the omniverse.
So with this definition of omniverse it seems that Mr. Mxyzptlk is at least on par with Owen. I say "at least," because Mxyzptlk actually destroyed the thing with casual ease. And while the omniverse in a box-feat is impressive it's not substantive enough to warrant that Owen could replicate Mxyzptlk's feat.
Originally posted by SquallX
Why?The positive belong to the original Monitor, where as the Negative belong to the Anti-Monitor.
Mxy also destroyed all timelines, including else world stories.
Emperor Joker also affected all versions of Hell and reality that were created from the minds and imaginations of DC New Earth.