Cool review. One thing I enjoy about Loeb's writing is the characters he picks! I love how this story involves Solomon Grundy, Poison Ivy, The Riddler, and a partnership between The Scarecrow and The Mad Hatter! Calendar Man is kind or a Mort - a "D"-List character. Here he's kind of rejuvenated. It's interesting you mention Hush; add Harley Quinn, drop Calendar Man, swap out Grundy for Killer Croc, and you have some similarities.