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Chaos Magic: Meteor Shower. Combined with "Emerald Boots," it can obliterate a huge number of enemy units.
Light Magic: All spells from the first three circles. From spells above the fourth circle, I would choose "Antimagic." Because it provides excellent protection against powerful magic.
Dark Magic: All spells from the first three circles. From spells above the fourth circle, I would choose "Dominate." Capture the best enemy unit and have it attack other important and dangerous enemy creatures.
Summoning Magic: Summon Phoenix. This is a monster of victory if there are no Cave Lords, Death Knights, or a hero with the "Deadly Chill" skill in the army. One strike can kill a huge number of low and medium-level creatures. The only drawback is its extremely high cost.