
Kayerloth |
No, Spellbane is only going to stop Greater Dispel Magic, not a Wish being used to duplicate the effect, nor will it stop Dispel Magic, Miracle or Limited Wish.
I would allow it to stop a Greater Dispel Magic generated by a SLA of a creature or one generated by a magic item since this would be the case for Spell Immunity/Greater Spell Immunity.
Then again I'm not sure I would allow Spellbane into my campaign (especially as is) ... it bothers me, the duration specifically. It would definitely carry a 'warning label' that it may find itself subject to change or banning, use at ones own risk.

Kayerloth |
I agree on SLAs and items that cast the spell but not items that create a constant effect similar to spell. Like magic weapon on sword or true see goggles.
If I'm following you I agree I believe the intent is for it to function against an item that 'casts' the spell not generally for it to function against something continuously active. Spellbane isn't going to stop a +3 flaming burst sword from functioning the way it would in an AMF ... it might however prevent its wielder from using its special purpose power to activate (i.e cast/SLA/command word into effect) a fire shield on the user 1/day.
All that said your GM is going to be the finale arbitrator on the issue.
And then there is the current thread(s) running on about the duration of things like a Hat of Disguise or a Ring of Invisibility and this leads into how you view Spellbane working (or not) against these items because of how they generate their effects (if one is going to be consistent anyway).