This deck isn't tier-1 competitive, but it is FAST. An average game goes no later than 7 turns with this deck; and remember, Purphoros hits ALL of your opponents at once.
Win Cons
Purphoros, God of the Forge
Get your god out and play creatures; It's that simple. Here's what combos with him:
-Panharmonicon - a creature ETB now deals 4 damage each, as well as extra effects. Playing Siege-Gang Commander deals a whopping 28 damage!
-Quest for Pure Flame - deal double damage for a turn, often more than enough to finish everyone off.
-Krenko, Mob Boss is a win-con in itself; makes massive amounts of goblins, and if you have 20 goblins you simply tap him and deal 40 damage instantly. gg
-Firecat Blitz and Goblin Offensive puts in a lot of tokens for ETB damage.
-Mogg Infestation is another win-con; build up your board and then sweep it for double the creatures and quadruple the damage.
-Norin the Wary blinks itself and is very difficult to get rid of; guaranteed ETB trigger every turn
-Kiki-Jiki, Mirror Breaker combos with most creatures to double ETB damage and tokens
-Grinning Ignus - after paying 3 mana, you can recast him for as much mana as you have for damage. This combos with Hazoret's Monument so that you can cast and get ETB effects from Grinning Ignus for as much red mana as you have.
Infinite Combo
Not a big fan, of them, but every deck should have at least one. This one is with Kiki-Jiki, Mirror Breaker and Zealous Conscripts. You have them both in play, and then you use kiki to make a copy of Zealous Conscripts, "gaining control" of kiki to untap it, then do it again. Infinite 3/3's with haste, and infinite ETB damage with Purphoros.
Burn
Make use of the massive hoard of creatures to deal massive damage straight to player's faces. This is accomplished in one of two ways:
1. Mana and burn - you accumulate a massive amount of mana and then use it with burn spells or even to make tokens, depending on your hand.
Mana
Neheb, the Eternal is my favorite card in this deck. You play him and get mana off the bat, and then playing creatures deals damage as well as accumulates mana. Incredible card.
Skirk Prospector, Battle Hymn and Brightstone Ritual - generate mana off of your goblins.
Mana Geyser is a fantastic card for EDH.
Koth of the Hammer with his -2 ability for mana.
Nykthos, Shrine to Nyx generates mana equal to devotion.
Extraplanar Lens - double mana
Burn
Goblin War Strike, Massive Raid and Burn at the Stake deal damage based off of your creatures
Flame Fusillade and Furystoke Giant allow your creatures to tap and deal damage to players.
Devil's Play is a burn-spell with flashback.
Firecat Blitz, Goblin Offensive, and Tilonalli's Summoner also use mana ramp for damage with Purphoros.
Swinging
Of course, we can swing with our creatures to deal damage to opponents. Purphoros, God of the Forge's activated ability can boost our creatures
Goblin Manipulation
Making Goblins
Krenko, Mob Boss is by far the best goblin-maker in the deck.
Goblin Matron ETB lets you tutor for any goblin in the deck.
Moggcatcher is better than Goblin Matron, allowing you to tutor for a goblin and put it into play.
Siege-Gang Commander, Beetleback Chief, and Goblin Instigator all make goblins from ETB.
Legion Warboss makes a goblin every combat
Chancellor of the Forge makes a goblin before the game even begins as and makes a large amount of goblins with ETB.
Mogg War Marshal is underrated imo; has ETB with Purphoros, and then makes a goblin off of ETB and when it dies with Echo. 3 ETB for Purphoros for 2 mana!
Dragon Fodder, Goblin Offensive, Goblin Rally, Hordeling Outburst, Krenko's Command, and Mogg Infestation are all sorceries that make goblin tokens.
Goblin Manipulation
Fireball creatures with Arms Dealer, Siege-Gang Commander, Goblin Grenade, and Goblin Bombardment.
Speaking of fireballing, Gempalm Incinerator was made to be cycled.
Goblin Chieftan boosts your goblins.
Skirk Prospector makes mana off of sac
Goblin Chirurgeon regenerates your best goblins off of tokens sac
Goblin Dark-Dwellers lets you recast instants/sorceries for extra mana/goblins/value - whatever you need!
Utility
Card Draw
I feel that this is an important thing to have in this deck, so there is a lot of it:
The classic Skullclamp
Mind Stone and Hedron's Archive provide ramp as well as card draw.
Mind's Eye provides draw as well.
Knollspine Dragon, Magus of the Wheel and Reforge the Soul provides wheel.
Chandra, Flamecaller provides nothing but value. Her +1 gives ETB damage off of purphoros; her 0 ability lets us wheel for card draw; and her ult is a board wipe if we need it.
Hazoret's Monument not only allows us to draw, but it makes our creatures cheaper. Great addition.
Wild Guess
Wheel of Fate