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I don't plan on very frequently having a big storm fest with Empty the Warrens , but I will admit that it is generally better than both the cards you listed to replace it with. The only thing is I don't own Empty the Warrens but I do own Dragon Fodder and Krenko's Command , which is the main reason why they are listed. Although I think Empty the Warrens saw a reprint in Modern Masters so it shouldn't be too difficult to find... Thanks!
Goblin Grenade would probably be underwhelming in EDH when everyone starts off with 40 life, unless you included some kind of damage doubler like Furnace of Rath or Curse of Bloodletting (for 1v1). You might be better off with the new Barrage of Expendables.
Barrage of Expendables
R, Sacrifice a creature: Barrage of Expendables deals 1 damage to target creature or player.
I like those enchantments, I will try to get a copy of one, or all of them, and throw them into here. The main problem with goblins in EDH is that players start at 40, so it is hard to rush damage. It's fun, but rarely works how you plan, normally I would just end up forcing a board wipe. However with those enchantments, effectively each player starts at 20 life instead, which would greatly increase my chances of doing lethal before they can draw into a board wipe.
Memnite Is free commander damage once Purphoros is on the board, additionally if you're going to try to swarm over your opponents with little dudes, you should not underestimate the power of battle cry creatures, such as Signal Pest , Goblin Wardriver , and Hero of Oxid Ridge . Don't forget that since you have so many goblins or goblin producing cards that Goblin Chieftain is a solid option. I'd suggest lowering your land count and adding more creatures with a low curve to take full advantage of every turn Purphoros stays on the board, such as Goblin Fireslinger , Goblin Arsonist , and Chandra's Phoenix (who can even come back when you burn and get an additional trigger on Purphoros!). Also, Burning Earth does stupid amounts of damage in EDH. Since you're mono red I'd add some Artifact hate as well, If you blow up a few essential early mana rocks in the first few turns, you'll be almost unstoppable. Into the Core has nice value.
Oh and good call on battle cry! I have a modern goblins deck that runs off of battle cry very effectively, so I know the power that it can have. Plus since those creatures are mostly small drops, it is easy purphoros burn which is the main idea behind the deck. I added Shattering Spree for artifact removal
I really like this deck!
Have you thought about Goblin Bombardment ? A fine answer to another players field wipe. With this one, or another sacc outlet, you can run several creatures without concern of having your general being exiled by creature removal.
I think I like Goblin Bombardment better, but thanks for the suggestion. I don't see how it is more readily available, since bombardment only costs 2 mana, so I will never have trouble casting it, and since there is no activating cost other than the sac I can use it to completely wipe my field to finish off the opponent. Also, since there is no mana activation cost, it can do twice as much stupidity with Summoning Station and any of the Pentavus -similar creatures.
Oh, another thing you're gunna want to watch out for is Elesh Norn, Grand Cenobite . If she resolves I don't think you can deal with her with any of the spells in your library, and she will kill most of the creatures in your deck as soon as they ETB. You will, however, obviously still get Purphoros's trigger to happen.
Ah, I gotcha. I'm probably just going to place an order on TCG for this, so availability isn't really an issue. Elesh Norn will be a problem, but the original idea of this deck was to kill all opponents simultaneously without the need to attack just through Purphoros' trigger, so hopefully if and when she resolves the game will be close to a close anyways, red doesn't really have the best creature removal anyways, especially for things with large toughness like her. I'll just have to push through with purphoros.
You have very few sorcery spells, so I don't think Young Pyromancer will be that great. I'd like to reiterate the suggestion of Mogg Infestation because it can be used to clear an opponent's board of troublesome creatures, or you can use it on yourself to get lots of triggers off Purphoros, God of the Forge .
That's incorrect. You cannot produce MANA of a color outside of your general's color identity, and you cannot use cards that have off-color mana symbols in their rules text (i.e. you can't use Bringer of the Red Dawn in a mono-red EDH deck).
You can produce off-color tokens if the generator is on-color.