So we all know how devotion works, this deck is trying to use what we've learned from top tier red devotion decks and apply some Johnny mechanics. (Hopefully staying competitive too.))
Oracle of Bones is actually a pretty awesome card. Most people will pay the tribute and take 5 to the face believe it or not. This card keeps opponents on their toes for sure, coupled with the following cards you'll be doing some serious damage:
Fated Conflagration depending on playstyle or your opponent, could take out a Siege Rhino, or go straight to the face.
Stoke the Flames is just an extra "big-burn" for Oracle to cast for you. If Felhide Spiritbinder happens to be out... cool you can tap him with this and use his inspired. (Just an option)
Magma Jet is great for getting rid of bad draws and taking out pesky Rabblemasters or Seekers.
Eidolon of the Great Revel is really good for this deck since you're mostly playing 4-drops.
Fanatic of Mogis is another MVP.
Purphoros, God of the Forge Deck wouldn't be complete without at least one.
Rageblood Shaman Gives your oracles trample, as well as the Fanatics... It also gives a minor buff to 13 of the creatures in the deck and 2 devotion.
Dragon Mantle I'm not sure about this card, but I figure it gives devotion and an outlet for nykthos fueled pumps. It replaces itself, so why not?
Felhide Spiritbinder is essentially a red whip that will soak up removal, or murder your opponent with Fanatics and Oracles from the graveyard.
Flame-Wreathed Phoenix I feel like this card is a better fit for devotion decks as it doesn't die as easily as the other two phoenixes.