[@Ghost Note]

The intro mentions sub-atomic manipulation as a power which Amethyst and I agreed should be the upper limit. Beyond that don't be to crazy and your free to do what you wish and aren't restricted to cosmic powers.

Edit: To also quote Amethyst here

"also, limitations on powers, we've been asked about - I'm gonna say anything to do with dimension bending (i.e. opening multiverse portals) or necromancy (i.e. trapping souls or bringing people back from the dead) is off the table."