Clay is really good. Philemon is arguably a more abusable drawing engine than Judges, and Clay has a bunch of really solid enhancements and splashable characters.
Balanced decks are "in" right now, as it is proving tough to win battles consistently without a healthy supply of both GEs and EEs.
In my opinion, the best defenses are Gray splash (drawing + Naaman, who is a monster in this meta), Crimson splash (mostly NT, but I like to add Nebuchadnezzar), and Orange. These 3 are head and shoulders above the rest. Gray can also use RDJ if paired with an OT offense, and RDJ is simply amazing.
Because Clay is so popular and usually doesn't have CBN enhancements, and because AOG decks are legit with all their armor/protection, horses are absolutely awesome on defense right now. When I play with my Gray splash defense, Naaman's Horses is more valuable than Scattered, in my opinion.