[Twan]

Mind Hunt is not that better than Seeking Arrow (which can't be resisted and kill most humans commanders), or Earth Attack and national assassination spells. In a large game trading for some antimagic amulets in not that hard.

Magic Duel is a spell very rarely used, it's just a problem if you have an astral 1-2 pretender and want to use it on the battlefield against an astral nation (not a good idea).

Master Enslave come late with slow research, remaining players should have a way to cast antimagic, but I agree in some situations (round one casting in defense, when the ennemy can't protect his army) it's one the most overpowered spell (like any instant spell not counterable in round one).

I'd like a game mechanic to be created, making impossible to use any instant battlewide offensive spells in round one (not only Master Enslave but also Rain of Stones, Earthquakes, Bone Grinding, Arcane Domination, Undead Mastery, Unraveling) so the attacker has one round to cast army buffs ; then endgame battles can't be resumed by "defender wins if he has mages and gems". But as this mechanic isn't present, and such a rule is totally unenforcable, I think it's better to play with them than to remove all the spells in this category (and see no reason to remove only master enslave, the problem is not a particular spell).