Aside from Stormbreath Dragon, Lifebane Zombie hits any of the major non-Planeswalker threats if you're on the play. Meanwhile, Nightveil Specter has become less effective as the metagame sped up thanks to Born of the Gods, so making that swap is easy if you want. However, Parrers chose to use both, which is also acceptable.
Another great addition is a hard-removal spell instead of some of the Bile Blights. Right now, you'll be hard-pressed to find an important target that Bile Blight can kill. Cards like Doom Blade, Ultimate Price, and even Devour Flesh tend to be more reliable.
While Devotion decks have suffered as of late, it looks like the blue and black versions have been able to adapt. The green devotion decks tend to fare worse against WU Control and Mono-Black Devotion, so a more robust green deck is necessary, hence the rise of RG Monsters. As always, the answer to any problem can be found by doing a little bit of fine tuning.
