Ivy 214B does lose to NM 3A on paper, but 214B is only one frame slower to impact than 3A, so you have to be pretty preemptive with that shit, lest you get stuffed or clash (I'm assuming NM 3A/Ivy 214B will clash anyway, rather than one just taking priority if the timing's right; I've only ever seen it win or lose though). Guessing wrong puts you at -20, which can end up hurting vs Ivy. There's the mix-up in whether or not you'll finish the string that helps mitigate disaster, but if you do and she defends properly, you'll eat shit. Ah, Nightmare. Thank god for CH 3A~3(B) hit confirm. Going to chock up a bit of the problem to just online nonsense. Sometimes four bars can be so suspiciously laggy, especially vs. A ranks...
Anyway, I'm going to start playing a little Ivy, see if that won't help enlighten me in the matchup. I was wishing there would be more match-up specific knowledge coming into this thread rather than general game advice like not attacking at disadvantage as if I was. The guy who said this was a bad match-up for Nightmare didn't really explain anything and the guy who told me I was a dipshit for getting spaced by a spacing character ignored my challenge. Not as helpful as I was hoping. Though, Ivy isn't really that common of a match-up for me, and I play constantly, so I guess it makes sense.