Harmonize on Graveyard makes sense, but not on Libro. That makes Dissolve too tempting. So far I've been playing with Libro rather than Graveyard, since a Graveyard build seems similar to a Lair build but with a better long game and a weaker early game. Using both seems like it would be too slow, but I may give that a try at some point.
What creature mix do you use?
So far I've really liked Venomous Zombies and Skeletal Knights. Crawlers and Minions felt too slow and not threatening enough. I need to try using Brutes at some point. I haven't done much with the other skeletons yet.