Mark "CMG" Clover's feed. Now I'm a sucker for these things and I know some folks aren't so while I'm committed to answering one question about my favorite hobby each day, and putting together a d30 table before the end of the month, I know not everyone is so interested. I'll put the question & answer after the break, posting late in the day, and not promoting this on G+ so those who don't like this kind of thing should be exposed only minimally.
I think this is the best I can do....
Day 24's question is "Favorite Spell".
I remember how much I loved slinging Magic Missile spells all day and the wide variety of Fireball spells were fun too. I ended up getting a metric butt-ton of Gamescience d4's and d6's because I had to roll so many so often, but I think my favorite spell was one I "used" so infrequently, but memorized more than once every day.
Preemptive Strike was practically written for my PC, who had the Paranoid Quirk. As soon as I learned (in-character) of the existence of this spell I did everything I could to obtain it because it made perfect sense that a paranoid DS Invoker, who gets to push a saving throw penalty for their spells onto targets.
Normally I'd toss in a couple fireballs and be done with it, but the GM ruled it had sufficient cover & concealment and it could move out of the blast radius too quickly. It took my PC getting attacked and this spell doing something like 3d6+17 points of damage, plus a Magic Missile to kill it so we could move on.
Luckily, since my PC was paranoid I had this spell memorized a few times.....