[Saulot]

Just as useful as a blacklist in my opinion, would be a 'cast this only' spell, for skellespamming, soulslay spamming, frozen heart, etc. just like how you can set fire, or attack.

Anyway, to answer KO's question, the one's I've noticed a lot are spells others have mentioned, namely; Astral Shield, Fire Shield.

Fire Flies could probably be lowered some, if a mage can cast fire darts, it pretty much always should over fire flies.

Phoenix Power, Earthpower, and Eagle Eyes could use a raise in their value, to help the AI.