Scene object to prefab

I have looked everywhere for ways to assign scene objects to a prefab but none is the way I wanted it. I need to be able to have an object in a scene, lets say a cube. I then stretch the cubes edges and give it anther texture (in-game). Then I want a script that every frame sets the cube to a prefab, so every little change gets updated in the prefab. So later in-game I can then spawn in that prefab with the same effects I left it with! If you could maybe direct me to something like that (I prefer js cause I don't know much about cs).