Creature (18):
2x Aurelia, the Warleader - Great game finisher, everything swings for double, can often make Purphoros a creature and when she has double strike the she's 12 damage by herself
4x Boros Reckoner - Kind of the core of this deck along with Stormbreath. A 3/3 for 3 with potential for first strike is good by itself but you can throw it in front of something huge (Obzedat, Polukaranos etc.) and either kill it off or deal the damage back to them
2x Brimaz, King of Oreskos - Just an amazing card, token generation works with Purphoros and in general it's a 3/4 vigilance which floods the board with small creatures
4x Precinct Captain - Great turn two drop, again, creates more tokens and first strike is really helpful
2x Purphoros, God of the Forge - One of the main win-cons, with any token generation, he deals insane amounts of damage and when made a creature (possible turn five) is huge
4x Stormbreath Dragon - SO good, four damage in the air turn five, then if you're against white it's pretty much indestructible and when made monstrous. Just wow.
Instant (4) 4x Boros Charm - So, either finish the game with burn, double strike Aurelia, Purphoros, monstrous Stormbreath or protect against board wipes
Sorcery (2) 2x Mizzium Mortars - Useful creature destruction or late game board wipes.
Land (24) - Need I explain? 8x Mountain 8x Plains 4x Sacred Foundry 4x Temple of Triumph
Enchantment (10) 4x Assemble the Legion - An amazing card, once it's out, you control the game and with Purphoros, does vast amounts of damage
4x Chained to the Rocks - Removal for almost EVERYTHING. Need I say more?
2x Legion's Initiative - Boosts all your creatures up and protects against boardwipes. Also, combo with Purphoros to deal two damage for every creature you control
Planeswalker (2) 2x Elspeth, Sun's Champion - Do I really need to explain why I have this? 3 soldiers a turn, stabilises if you're low on good creatures and they have loads and have you read that ultimate?!?
Sideboard:2x Blind Obedience - Pretty simple really, any deck with haste in, or vs. Advent of the wurm/Boon Satyr. Really useful against aggro.
3x Glare of Heresy - In the current meta, almost all control uses white and this can get rid of those pesky d-spheres, Assemble the Legions or Elspeths.
2x Hammer of Purphoros - If you're up against control, you want to be doing as much damage as possible early game, so side this in and you'll be able to swing for loads turn four.
2x Mizzium Mortars - If you're opponent is running Blood Baron or Stormbreaths that you can't kill off with Chained to the Rocks, then add this to make it more likely to kill them off.
4x Soldier of the Pantheon - Along with Hammer, this is there so that you can turn aggro when against control and do more damage early game.
2x Spear of Heliod - If an opponent's deck relies on their big beasties, then spear will stop them from attacking or kill them off when they do.