This is the deck that I play FNM with. It's cheap, fast, and able to respond to most situations. The plan is to win in 6-8 turns. Attack each turn if you can, it's all about getting that life down.
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Main Deck Strategy:
Rakdos Cackler - Cheap 2/2 for 1
Boros Reckoner - This is a great defensive card. When going against big creatures, the fact that you are taking damage received and damaging you opponent with it is great. What makes him even better is his 3R devotion. Mogis's best friend.
Burning-Tree Emissary - These guys are pretty great to get in your opening hand or first couple of draws. Establishing an early board presence with these give your opponent something to deal with early on. Also good cheap devotion for our mogis.
Chandra's Phoenix - Decent devotion, flying with 2/2. Good for swinging on turn 3-4 over blockers.
Legion Loyalist - One drop with a great battalion ability and haste
Ash Zealot - A 2/2 with haste and 2 red devotion, ready to swing on turn 2.
Foundry Street Denizen - Great card to play on turn one, if you have three 1 drops in your hand, your swinging 3 damage on turn two
Flame-Wreathed Phoenix - An interesting flyer with the potential to be a 5/5 with tribute.
Hammer of Purphoros - Decent devotion, also great mid game if we have more then 5 land, we can just start burning land and dropping in 3/3. It's also great to give everyone haste, cast and swing.
Purphoros, God of the Forge - great all around card, he's a god, damages for two when you play your little creatures, buffs everyone.
Fanatic of Mogis - My favorite card in the deck. Once you have your devotion built, you play this guy for some serious damage to your opponent.
Magma Jet - creature removal, only card we have that can help us with draws, play damage
Lightning Strike - Cheap creature removal, damager
===========Side Board:
Act of Treason - This card is great against creature heavy decks / mirror decks, taking a blocker out of the equation and adding an attacker is always nice.
Peak Eruption - If we are facing another red aggro deck, this is a great way to them down.
Guttersnipe - If I find that I am having trouble getting around a lot of creatures, I bring in a play set of these along with Mizzium Mortars, The plan is two hit the player directly for spell damage, regardless of how many blockers they have. It also changes this deck strategy enough to throw your opponent off a little bit.
Mizzium Mortars - great removal
Purphoros, God of the Forge - If I want to increase the chances of getting this guy out.
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This Deck worked well for me in theros standard, I'm currently at about 22w/6l for the season. I added a few maybe cards from born of the gods, any feedback would be great.