1 for each archdevil (Asmodeus is the same as the base version, so I count them as one. 10 otherwise) + 4 (feral, winged, dark tongue and hellfire) variants you can mix and match on top. That's 13, unless you consider every possible combination as a separate race, in which case it's 72 (9 archdevil variants times 2 for normal/feral ASI times 4 for infernal legacy versions)