Adamantian

I think you should main board at least one anger of the gods and at least one bile blight for this build. I just made a different version of this deck if you'd like to check it out. :) great deck!
http://www.mtgvault.com/adamantian/decks/four-color-combo/

You need to make an Elspeth one

You might want to change your mana ratio. The bar on the site show that you have 6 times as much black mana symbols as white ones, but your land choice doesn't reflect that. :P really cool idea though! Sorin is a beast!

Maniacal maniac, I don't believe he intended for this deck to be taken seriously, sometimes the front page needs decks that are just a fun combo that never works or a ridiculous deck that makes people laugh. :) for example, see my "not so budget deck" and you'll understand what I mean.

Omniscience, enter the infinite, main board the cards in your sideboard, capture of jingzhou, dack fayden, Chandra pyromancer, take out a lot of the auras, they're not so good with her, I only run eldrazi conscription. Put in some creatures that are broken with narset like aurelia, medomai, grand arbiter, etc. I like this deck. I'm just a combo player that wants to help make it even crazier. :)

You're missing the new five from c14

Sadly, enter the infinite is banned in commander. :P

I actually think that you should switch white for black. Because that would let you run demonic tutors and vampiric tutors over the white cards you use...

HAPPY BIRTHDAY!!!!! That's great! And I LOVE the deck. Some people hate combo decks, but they're just jealous haha! I like the idea of diamond speeding up your game! I used to have a vintage deck that did something like that.

Of course!!!

Would a sol ring count as not budget? Because sol ring is pretty important...

The flavor part makes sense I guess. Haha, I really like the idea though! And I love the card pestilence! And yeah, I have a new deck, but it's commander and I know you don't play commander. So you can check it out if you want.

Exquisite blood!!! So that you never lose life from pestilence! And switch kiss of death for sorin's vengeance! And put in urborg to make your coffers swamps!!!

To bad there's no white for ghostly prison...

I certainly hope he's kidding. XD

If you ran black you could use illness in the ranks...

Yeah, that makes sense. My deck is more of a control deck and only runs brimaz as far as creatures. So it's a lot different.

What do you think of adding Elspeth? I have a deck like this and elspeth absolutely destroys in it.

Can you explain how they slow down the combo please? That's where I'm lost. I play tested your deck and it rarely had the combo, so I figured switching the mana dorks for tempo creatures would help, and it did.

Put in red blue or white creatures then. Prime candidates include brimaz, seeker of the way, and mantis rider for alternate win con.