Regarding spells, more than a dozen have been suggested. Is that not enough?
As a suggestion, I propose a 5th-level spell, replacing Armageddon with "Confusion" - all units on the battlefield randomly change their speed, initiative, damage, defense and attack skills, HP, and may (50/50 chance) change allegiance to the player casting the spell - to the opposing player, and vice versa.
Auto-translated
