Marked for Death - Ench. makes all attacks against a target +1 dice
Bear Strength - Gives target +1 melee
Ghoul Rot - Target takes 1 direct damage every upkeep phase
I play with these constantly, no matter what spellbook I run. Ghoul Rot is crazy good on a mage, Marked for Death as well. It's basically like playing Bear Strength on every creature that chooses to attack the mage, so there's a lot of bang for your buck.