Salient

"When actions go on the stack, the prices of those actions are not actually payed until the action resolves on the stack"

This is not a true statement.

"the Pyromancer doesn't tap until his ability actually resolves"

...this is also not a true statement.

Your combo works, but not for the precise reasons you perhaps think it does.

Fume Spitter feels redundant and a little weak in this deck, but I suppose the options for alternatives in Standard aren't terribly good right now. I'd include some fetch lands (Verdant Catacombs?) to help you trigger Bloodghast and thin the deck, maybe instead of Piranha Marsh (or just instead of four swamps).

Why isochron scepter? The only imprintable spell you have is Fog, and they'd be able to blow up your Scepter.

Love the sideboard.

I'd suggest Lightning Bolt over Turn to Slag. Lightning Bolt should be cheap these days, and it's considerably more efficient. If you're really going for the "destroy artifacts" binge, though, try Nature's Claim over either of those.

I really like the Pestilence Demon + Vengeful Archon + Necrotic Ooze combo. That's great.

This deck is awesome.

This deck needs Greater Morphling :D

Again, your deckbuilding would benefit from the "only 4-ofs" rule that I suggest for new players. Of the cards you use, choose only the very best ones for the deck, and run four of them. (You could run less than four of the legendary cards and of rare cards you don't have enough of, but for ordinary commons and the like, you should try to stick to four-ofs or none-ofs.)

In this case, I recommend:
4x Knight of the Reliquary
4x Merfolk Looter
4x Bant Sureblade
4x Winged Coatl
4x Evolving Wilds
4x Terramorphic Expanse
4x Realms Uncharted (this thins your deck out and supports Knight)
+ other stuff

I suggest dropping:
Excommunicate (it's not very useful, even just compared to Oust)
Obelisk of Bant (you don't need a ton of mana for this deck)

Sure I'll take a look.

Sure thing :)

There's a lot of 1-ofs and 2-ofs in the deck. Do you think you could consolidate around the most reliable cards, and put 4-of each of those in the deck?

I agree that Kor Spiritdancer is a must-have in any Auras-based deck, but beware: when an enchanted creature gets killed by a card like Path to Exile, you're losing both the creature and all its enchantments. You're very vulnerable to creature removal. (Notice that Umbra cards don't protect versus exile. If your creature gets Pathed or Swords'd, you'll lose both it and the Umbras on it.)

So, you recommend making the Lands deck not a Lands deck?

Wait, what? What 1-casting-cost card draw spells are available to red-green-white?

Even blue doesn't have 1cc draw spells (other than Ancestral Recall); it has hand fixing spells like Brainstorm and Ponder, but those don't generate card advantage.

This whole deck is kind of built around valakut. Obviously the plan is to use the Titan, Cultivate, and Harrow to throw a ton of Mountains down. I'm not convinced it will work (especially with only one Valakut), and it seems awfully slow, but it's at least worth a try. With two Valakut (which get searched up via Titan), the Lightning Bolt ability triggers twice per Mountain.

I predict some version of this kind of deck will become popular, if only casually. Titan Valakut is too much fun to pass on entirely.

Heh. Nice deck name. I wonder if anyone has put together a werewolf deck for Jacob.

In fact, I was thinking of mainboarding Stomping Ground, which would make for the debut appearance of that card in Legacy. The fact that it would come into play tapped late-game is irrelevant.

I don't think this deck outperforms Aggro Loam, though, so it's a bit moot. But let me tinker with it and get some Stomping Ground goodness in the main.

There are nine mountains in the deck: four Taiga, four Volcanic Island, and one Snow-Covered Mountain. But I agree, I should make room for more.

This deck could use a Sundering Titan, in its sideboard at least, as its "King" :-)

Also: Goblin Settler + Astral Slide could be really funny. I didn't know that card existed.

Neat. Seems like, with the eight allies in the deck so far, you'd get more mileage out of Ondu Cleric than White Knight.

I wonder if this deck could use some Captured Sunlight. Maybe run one instead of an Iona? (Four Iona seems a bit much.)