No TMNTemps, even better. 
Here’s a video:
[media=youtube]7sxcRYgs7vE[/media]
The method is a bit tricky. The idea is that you do a st. S, cancel into super jump and perform an air Crescent Scythe as close to the ground as possible. Since there’s some input leniency, I actually use a 360 motion to pull it off more consistently. Here’s the input (as if I’m facing right, not left like in the video)
X-factor (lv2 or lv3): st. :s: :f::uf::u::ub:
:db::d::df::h:, :qcf::l:, land, :qcf:
(full charge), st. :s: :f::uf::u::ub:
:db::d::df::h:, :qcf::l:, land, :qcf:
(full charge), st. :s: , etc…
As far as I can tell this is a true infinite and it works on all characters. My execution isn’t really good enough to keep this loop up for the whole 20 seconds, but it seems like the moves involved all cause enough hit stun to loop indefinitely (not that you’d ever need to do that, but just to prove it’s a true infinite). It works in both Lv3 and Lv2, although the timings are a little bit different in each.
Things that you could go wrong if you miss the input/timing:
[LIST]
[]Nothing comes out after the S, make sure you are hitting up in your motion
[]You get air H or air Talon Dive H instead of air Crescent Scythe H (this happens to me at the end of the video - notice that Nova actually flips out of it before the Talon Dive even lands, lol). This is usually caused by missing the motions or doing an incomplete motion.
[]You might get a ground Crescent Scythe H (not sure why this happens, but it can, maybe for doing it too late? You want X-23 to say “You like that?” and not “Weak!” - the second is for the ground Crescent Scythe)
[]You get another ground move like Decapitating Slice (probably also from doing it too late)
[/LIST]
You can also start this loop off any touch from any combo. Just X-factor and start the loop with the OTG. Much more useful than the Neck Slice infinite, that requires you to land Neck Slice on a landed opponent.
Hopefully everyone enjoys this… definitely something worth practicing for ANY serious X-23 player. Someone do this in a major so the whole world can get hype 
edit: I read somewhere that TMNTemps was trying to shrug off his old name so I changed above 