Some of my old MoM favourites:
Nature's Cures (global spell): All your units are fully healed after each combat. Great for sustained offensives!
Shadow Demons (summons): God, those little flying, plane shifting, regenerating, ranged shooters were overpowered. Contributed greatly to keeping the Death Magic range viable.
Fountain of Life (city enchantment): instantly solves any unrest problems you might have, and boosts population growth no big Life city should be without one.
Chaos rift (negative city enchantment) lay this on an enemy city and it randomly fries population, buildings and troops each turn. Fun, fun, fun.
Call the Void (overland attack spell) Magical nuke. Totals most of the city's buildings, slaughters scads of population and troops and showers the city's area in long term magical fallout. You can also use it on free roaming armies etc. The ultimate in long range mass death spells, (globals can be removed or even stolen too easily) what's not to love?[e digicons]}
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The whole range in local/global "boost my magic type/troops, curse yours" such as Dark Omens etc. Also, that nifty little Sourcery spell that lets you steal enemy Global Enchants. Yoink! [e digicons]:bebi:[/e]