Wondering if anyone has ever tried Goblin Lore in this deck? It seems like most of your potential random discards you want in the yard anyway, making it something of a 1R Ancestral Recall, with potentially even more upside. Almost like casting both halves of faithless looting for half the mana.
I think Desperate Ravings is better if you can manage the blue splash because it can be dredged into. Goblin Lore seems okay, but even with Ravings I wouldn't want too many of these effects above 4x Faithless Looting (which gets the nod because it costs less on the front end). Maybe only 2-3 more of these.
I don't know about Torpor Orb. I might go with Dismember instead for Twin. Rakdos Charm is a good one, I might play that myself. I think you might want something more against other graveyard decks, and maybe the Inquisition of Kozilek in the side for combo.
I really like the idea of having Pyroclasm in my mainboard. I'm not sure if I'm comfortable dropping Seismic Assault to 3, I've already have a hard time finding one with 4 (please note, that this may be because I'm not that experienced with this deck).
Looks good. I might go:
-1 Seismic Assault
-1 Inquisition of Kozilek
Pyroclasm seems really good to me now. It is good against these decks in your meta:
Pod (mostly Melira), Junk, Affinity, Elves, UWr (Geist)
I probably wouldn't play Abrupt Decay main. It's a fine card, but I might want the 3rd Lightning Bolt instead. Decay is good, but many of the decks in your meta are creature decks, and bolt is better against the creatures in them as well as stuff like Ajani Vengeant. Bolt is dead against tron, but Decay doesn't do much there either, and you have Smallpox.
I play a similar deck and have problems with 3+ toughness creatures in general. You don't draw pox or bolt every game, and you can just die to creatures and burn fast. I think Loam is one of, if not the, most powerful engines in modern. The trick is finding the right mix of stuff to keep you alive until the late game.