Recommendation from a Dragon magazine article:
When making enemy spellcasters, just select 3 spells from the highest level they can cast (and they can even be the same spell if desired), and that it what the spellcaster uses for the battle. On the off chance that the spellcaster survives more than 3 rounds (rare), she'll probably want to run anyways, or fight with a weapon or magic item or somesuch.
imo: The trickiest situation is when a spellcaster has several rounds to buff before attacking the PC's. DM's should either stay away from those situations or prepare them fully in advance... unless they are particularly experienced and are very familiar what sort of buffs would be used, or still have a list from earlier enemy spellcaster preparations (i.e. including all modifiers).
When making enemy spellcasters, just select 3 spells from the highest level they can cast (and they can even be the same spell if desired), and that it what the spellcaster uses for the battle. On the off chance that the spellcaster survives more than 3 rounds (rare), she'll probably want to run anyways, or fight with a weapon or magic item or somesuch.
imo: The trickiest situation is when a spellcaster has several rounds to buff before attacking the PC's. DM's should either stay away from those situations or prepare them fully in advance... unless they are particularly experienced and are very familiar what sort of buffs would be used, or still have a list from earlier enemy spellcaster preparations (i.e. including all modifiers).