My current G/b devotion deck, made with Theros block and M15 cards to start planning for the rotation, had some trouble against the M15 Clash Pack yesterday. It could easily have been just plain bad luck (I only hit 1 land with Courser of Kruphix out of 12+ draws). I did see that Hydra Broodmaster is incredible when you have even 9 mana from Nykthos. I was thinking about it for my deck along with Soul of Zendikar and Innistrad. G/u devotion is looking strong as well.