Thanks. That actually answered some other questions I had, though I think I wasn't quite clear with what I meant with the one I posted. If the Mimics cast Acid Cloud (as an example), a mana-spender, does it count for triggering the damage boost from the Zuni 6 piece (as if I had cast it)? The info doesn't seem to say that it does or does not, only that they benefit from the damage boost.
It does not trigger. YOu need to cast yourself