Paprika has teleports to get around zoning, and her charge c can come out fast enough on reads to beat out Oleander's fireballs. Arizonas who have good spacing and reactions can quake out or rope to counter Oleander's fireballs as well... I need to lab this when I get back from work, but I THINK Arizona's low rope has a bit of an extended hitbox compared to standing rope? If the rope lands, fireballs disappear. Arizona's dead angle can also allow her to close distance against a fireball spammer. (Source - tried to do this against Arizona player at Frosty Faustings - these were his answers. Also, he had better spacing and reactions than I do, his rope punishes were really nice) It also seems to me that if an Oleander tries to go into a straight fireball war against Velvet, Velvet overwhelms her.
What I don't quite know is what answers Arizona has against Tian. To me, that's the only real problem matchup that exists in the game currently, and I don't see the matchup very often in Fighting Foenatics.