AI trigger question

I know it's possible but I've never messed with the AI trigger functions before... So I was wondering, how do you make it so that when the comp player has thses units: sorcs, necs, priests, witch doctors, shaman, dotc, dott, and banshees; how to make them cast there spells when they are attacking, i.e. posses, cripple, polymorph, slow....ect

I know there has to be a really easy way... easier than making a unit is attacking, attacking unit = "unit"; cast "w/e" on unit being attacked... this way would take forever.

Help would be very very appriciated, thanks.

Try using the AI Editor, i never really messed around with the AI editor alot, but i think there are ways to make this possible. The units are meant to automatically cast their spells when AI is in place.

where's the AI editor? is it that thing that looks like a book?

k ill try messing around with that thanks.