I obviously disagree
I've only been hit with it once, and didn't remember didn't check if it hit gems because it got dispelled the next turn.
Its not a matter of how nasty a spell is, its whether or not there are realistic ways of countering it. Even if gem income were reduced to 90% it could still be dispelled.
You can counter AN as well, but as mentioned before it has the chance of enabling a 999 cast, repeatedly.
very simple, get the 60 and vote it.