@BlueSky44

Oh - my mistake (RE: the stuff not under the hider).

And yeah that makes perfect sense - exactly the kind of scenarios (unfair/too easy) I'm wanting to avoid.

So regarding that, I did write she can manifest "any power that she knows of" - I meant it that way like your example: she has to know those powers exist in some other mutant already (there has to be a known precedent) before she can manifest them.  My present thinking is she doesn't have to know them personally. Like if her sister said "you know, there's a kid in my class who can turn one material into another", that would be enough for OfAll to do the power, too (possibly after getting some further detail).  Though I could change it to where she needs personal experience with the power (i.e. direct witnessing, not even through TV), which would limit. 

Timeframe between could also, as mentioned, be more stretched out, like every few or several hours. Assuming most battles don't take that long, she'd likely be working with max 2 powers per battle.  

Or how about these alternatives: 
1. She can deplete her current power thereby being power*less* until the timeframe elapses where she can switch/reset.  And depletion point would be power based. i.e. maybe she can telekinetically move books around for ages, but only telekinetically lift two trucks and then nothing more even if that's only a couple minutes into her power selection; still has to wait 'til she can swap in another power.
2. Her powers are restricted to base levels, or like a video game; depends how much she's used that particular kind throughout her life. Like, Restriction Example: Professor X can effortlessly throw his thoughts into (at least) every mind in the Mansion at once. OfAll, say, could only throw her thoughts into the minds of those in her visual vicinity [b]no matter[/b] how many times she's manifested psychic powers. Or Video Game Example: perhaps she's only tried optic blasts a couple times, so they're little more than the power of Cyclops' on [i]low[/i]. But maybe she's tried ice powers more regularly, and can icify her whole arm by now. 


In any case :)  I can't do any edits until the weekend.