You are a Beyonder
You are an all powerful entity of your own reality. In that reality, you are everything, everywhere, and know everything. There is nothing in that reality that you can not do. You are so powerful, that if you were to enter another reality you would destroy that realities entire multiverse.
You have seen both the DC, and Marvel Universes. One day you notice the appearance of many powerful beings in those universes, and after eons decide that you want to investigate them. However you know that if you were to enter them, your presence would destroy everything. You create an avatar of yourself to do just that. It is you, and it has a lot of your knowledge, but it has been dramatically decreased in power to the level of a Sky Father like Odin. Even at a reduced level, no team would be able to stand against you for long. Once done you erase all events that occur during your assessment.
You are mostly curious about the Earth's in both the DC, and Marvel universes, and would like to test out just how powerful the heroes on those worlds are. Imagine this being like playing a video game. If you played DC Earth on Normal difficulty in terms of combat encounters, what difficulty would playing Marvel feel like after defeating every hero on DC Earth?
Easy, Normal, Hard, Insane... What would be the difficulty curve?