Hmm, I find a significant lack of creatures that have arcane spellcasting as part of their race, or at least things with Wall of Iron as an SLA. I'm in need of many castings of Wall of Iron on the cheap, and buying scrolls of it myself not cost effective due to the amount, so I was going to summon some creature which can do it for me. There's Nagas (which aren't outsiders), and that modren the Tertian, but most things that can be summoned and have spellcasting have divine casting.
Help me seek out arcane spellcasting creatures that cast as a wizard or sorcerer, or barring that one with Wall of Iron as an SLA. I know about Efreets and wish duplicating the spell, but that one's been ruled out already.