Only items with non-BE/BF, non-summoning, caster-targeting OBS:
Copper plate, as mentioned above.
Bell of Cleansing: Not sure if this is a caster effect. Maybe.
Crystal Shield: I'm pretty sure you'll get PoTS on the slaves with this one.
Sandals of the Crane: Yes! Insta-blink on the communion, woo hoo!
The Black Mirror: Grants Disbelieve. If that's AoE 0 on the caster, slaves get it too. Not exactly anything to go crazy about.
That's it, I think.