Yeah, the oracle still gives common cards. I've gotten one or two in between the high influx of nymphs this past month.
And technically it's five times (ten relative to purple nymph) less likely for you to get a non-nymph, assuming I didn't misunderstand the probabilities mentioned in one of those old oracle-nymph probability threads.
Actually no, forget that. I have a feeling I probably did misunderstand.