The only Exarch likely to see play, it's actually not terrible by itself, but sadly it'll just be a dirty combo peice with Kiki-Jiki (a la Pestermite). I'd like it enough to actually play it if you could do both modes, but as is, I'll pass.
And that wraps up our look at blue. This time the big fat Mythic is a horribly anti-fun card, and should never be played, in my opinion. I'm so disappointed! Fortunately the Metamorph goes a long way to making up for that let-down, Rafiq decks got another really good Infect tool, Proliferate got multiple options, and the Chancellor just looks like a really fun card. So, not too shabby, despite that fucking Praetor.