One of my faves was reflect 100% on self for 1-2 seconds. It acted as a low cost, timed parry and was mega fun to fight mages with.

You can do the same with sanctuary, but any % of sanctuary is useful, and people really sleep on it imo.

ETA: Just remembered another old fave, very low damage fire damage on target, enchanted on something. Because there's no cooldown for the animation of casting from an enchanted item, it was basically a little flamethrower. I liked to put it on my gauntlet and feel like Boba Fett.