>>95918062
My personal list of "OP if (not) done well" includes:
>light manipulation
Shit gets ridiculous real fast if you have at least some knowledge of physics.
Being able to change the wavelength makes it even crazier.
>transmutation
Even without matter-energy or matter-antimatter conversion you can still make things like chlorine trifluoride, U-235, fluoroantimonic acid, anything chlorine or fluorine-related really, that shit is scary. Not to mention the various explosive compounds.
All of that can literally be made out of thin air if the conversion is anything-to-anything, rather than 1:1 with material merely being rearranged.
>anything atomic-related
Putting aside things like hard ionizing radiation hazard, you can fuck up just about anything if you can fuck with the nuclear forces that bind matter together.
>portals
If you can cut stuff by closing portals, it becomes a terrific combat power that is often gravely underestimated.
Multiple portals paired with area-based abilities and whatnot can extend them to affect the whole battlefield via pinhole portals.
If portal ability has a range limitation, assuming no absolute range limit and multiple portals, you could chain them indefinitely via the same space folding-like effect as with pinhole portal technique.