[rtkwe]

That should be valid. Though if your opponent knows the real number you need to hit and can interrupt your cycle they could choose a lower number in which case I guess you'd be best off just shuffling your library to 'resolve' the number of loops cast.

I'd do it for 98 cards though so you could apply the number in (c)EDH where you're likely to actually see this combo happen though. It would still be valid because if you can sort your library to an arbitrary state S in N moves you can sort it to a state S' that could result in S in any number of moves greater than N as well.