Walkthroughs for custom maps.

Another interesting point (I don't know if it's described anywhere): even the Sphere of Inhibition doesn't prevent enemy storm birds from hitting you with lightning, so you need to wear the Amulet of Negation in battle.

Yes, everything seems a bit ambiguous regarding autocasts of creatures with probabilistic effects under the influence of prohibitions. In my opinion, they should trigger almost all the time.
For example, I definitely encountered a situation where phoenixes resurrect in an antimagic garrison (and, therefore, also with the Spell Immunity skill).
But another example surprised me - on cursed ground, bone dragons attacked a stack for about 20 rounds, but the aging effect didn't trigger. Although, at the same time, the viper's poison was applied quickly and multiple times. Maybe I was just unlucky - more extensive tests or studying the game's code are needed. I think that petrification, deadly gaze, blindness, stunning, and dispel effects will also work.
And, speaking of ambiguity, we can recall that on cursed ground, djinns and sprites cannot cast any spells, although, in theory, they have spells to cast, since cursed ground does not impose a prohibition on 1st-level magic.