Anyone else been playing Ghostricks? They aren't that good competitively, but they're REALLY fun. Skeleton has good mill power, though it is a bit slow. To Skeleton's credit, though, it Banishes cards, making them unusable, whereas regular milling might as well be a plus for the meta (cough cough Machine Angel Absolute Ritual, Red Eyes Spirit/Wyvern, Bacon Saver and Gozuki cough cough). Mummy is a decent swarmer. Ghoul can boost your attack up to 4100 without equip or field spells.
I reiterate: These are by no means top tier, or even tier 2-3. They are, however, incredibly fun to play with, and that's what I like to see in an event.