Ok, this is pretty obvious. QAKE or PURE are at the top of my lists. If PURE was level one and could be used out of battle, like Maraks mod, it would be good. QAKE would be good if it worked once in a while.
LOK2 was dumb as well, come to think of it. I'm too lazy to get a list of spells, so don't blame me if I missed one.
Also, to lengthen the thread some, we'll include enemy spells. Yes, I know INK. That's blatantly obvious. INK sucks, so no one has to elaborate.