Looks like your muldrifter idea has taken off. I hope my previous post wasnt construed as saying your idea didnt have merit. What I meant was that you should be posting your stuff into the other post so we can keep all this great info in one place instead of it getting lost in multiple threads.
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S'all good.

Did you test any matchup against archetypes ? The list seems to be well built, but I wonder if you can beat aggro-control and Ichorid with it.
I haven't done much testing yet. I'm still not perfectly happy with the deck and the Sideboard wasn't decided at the time (which makes it difficult to play since I'm banking a lot on Wishes) and I'm testing out some new cards so I haven't quite had a deck yet to test... but the way I envision it....
Against Aggro-Control, it depends on the sort of clock they have on because the answer is typically a Wish. Luckily Wishes can't be Extirpated (well, unless they Duress it first).
Cunning Wish -> Slaughter Pact/Snuff Out for Tarmogoyf, Juggernaut, Dreadnought, Magus of the Moon
Cunning Wish -> Darkblast for Welders, Confidants, Shamans. Though it's inefficient, this will probably be my answer against 2 toughness creatures as well.
4x Thoughtseize is huge against them since you can typically get a creature (and typically their bigger ones) so it can give you creatures to Animate against them.
Ichorid is blah. Though I'm working on it. Post board I at least have 4 Extirpates. Mulldrifters can randomly take out some bridges.
Workshop: Mulldrifter ignores 5 of the 9 spheres. Cycling Clear ignores all of them. On play the Duress/Thoughtseize effects can be huge. On draw, it depends on what they drop on turn 1. Additionally, we have Wish->Rebuild.
Storm: 8x Duress/Thoughtseize and 2x Extirpate maindeck and only 1x Brainstorm to hide their better cards is usually enough to slow them down.
Slaver: As long as you don't walk your Mulldrifters into Mana Drains you should be okay. If they are lazy about their graveyard you can punish them with an Animate spell.
Oath: I run 4 Clear maindeck.
The idea of Mulldrifter is excellent. I had also tested it, it replaces well Deep Analysis.
The 4 Wish may be a bit slow, and make the deck less resilient. You cut down the most important card in Dragon : Intuition. Any Dragon player should play it. It's a tutor, and a graveyard digger.
My main problem with Intuition is that it is a very graveyard/deck reliant card. Any card I want I have to have 3x of in deck, and the best combination (3x Deep Analysis) isn't good against Extirpate/Leyline of the Void/Tormod's Crypt, etc.
I'm offering Wish as an alternative to Intuition (so it's the same speed Intuition would be). Intuition -> 3x Deep Analysis = +2 cards for 5 Mana (assuming 1 flashback). Wish -> Ancestral = +2 Cards for 4 Mana. Or alternatively Wish->Gush +1 cards for 2 mana (assuming you can replay a land that turn) or Wish->Skeletal Scrying for +X cards for X+4 mana.
Additionally, if your Recall gets RFG, then you can Wish it back. Wish, Recall, Wish, Recall = +4 cards for 8 mana. This gives it an advantage over Intuition against Extirpate/Leyline/Crypt as Intuition is horrible against them.
So in terms of CA it is *roughly* the same. Intuitiion -> 3x Deep Analysis is great (and better) when you get the full mileage out of it, but Wish works just as well in the beginning and doesn't need the graveyard to function properly and allows me to not run Deep Analysis which I find to be sub-optimal without support.
As far as a Tutor goes, Wish tutors for the same cards and without having to add 3x of the card to the deck. Most main deck cards are redundant anyways. Wish->Entomb can get your Dragon to your graveyard off a Wish just like Intuition could. And Wish->Pull From Eternity gets it into your graveyard when Intuition couldn't. I could run Vampiric in the board (I currently don't), but that could also get you any card in your deck as well.
Are Brainstorm and Ponder necessary ? You cut 2 bazaar for them, but is it interesting ? Bazaar can shuffle Darksteel Colossus into the library, no need of Brainstorm or Ponder for that.
And how do you manage gravehate like Leyline of the Void ? 4 disrupt spells are good to protect the combo, but sometimes, the opponent will be able to fetch an Extirpate and to play it before you can disrupt him...
Brainstorm and Ponder were just place holders. I've cut Tinker as well.
Against Leyline I'm running 4 Clear maindeck because it cycles if I don't need it. Against Extirpate, I like the Pull from Eternity option.
I suppose given 4x Maindeck Cunning Wish, the full sideboard should be listed.
SB:
1x Stroke of Genius
1x Ancestral Recall
1x Gush
1x Skeletal Scrying
1x Darkblast
1x Slaughter Pact/Snuff Out
1x Entomb
1x Pull From Eternity
1x Rebuild
4x ??? Ichorid Hate, probably Tormod's Crypts, but I'd rather have something more useful generically.
2x Extirpate
The main deck has also changed a bit. This might be a change for the worse, but I'm trying some new things out.
4 Polluted Delta
2 Flooded Strand
4 Underground Sea
1 Tundra
1 Island
1 Swamp
3 Duskmantle, House of Shadow
1 Mox Sapphire
1 Mox Jet
1 Mana Crypt
1 Sol Ring
1 Black Lotus
(21 Mana sources)
4 Worldgorger Dragon
4 Mulldrifter
(8 Creatures)
4 Animate Dead
2 Necromancy
(6 Animates)
4 Cunning Wish
4 Clear
3 Read the Runes
1 Demonic Tutor
1 Brainstorm
(13 Draw/Tutor)
4 Thoughtseize
4 Duress
2 Extirpate
2 Mana Drain
(12 Disruption)
A little more on the card choices.
Zero Bazaar of Baghdad
Highly, controversial I'd imagine. I don't like Bazaar because it doesn't generate mana, and particularly in this Deep Analysis/Squee-less deck, there aren't that many card I want to be dumping into my graveyard. Plus against Extirpate/Crypt/Leyline it is much more costly to straight out loose those cards. Duskmantle, Cunning, Read, and Mulldrifter in play to me are sufficient win conditions. No Bazaar also frees up a card slot that Oona or Witness would take.
Duskmantle, House of Shadow
New card I'm trying out..... With an Underground Sea in play, it wins on a Dragon loop. Mill the opponent's deck, then mill your own until you get a Mulldrifter in the graveyard, then pass the turn. I cut off the off-color Moxes for this, giving Gorilla Shaman fewer targets. Technically, you have more Wasteable targets, but that can actually be a bonus. Dustmantle is a win-condition while it's on the board, which means that it's a priority to take it out. Which may make them opt to take out the Duskmantle over your Underground Sea.... maybe.
No Tinker
I've just started trying this configuration out, but with Clear in the main deck and Pull From Eternity as Wish target, I don't really worry about alternate win conditions.
Extirpate
Well, since I decided to run 8x Duress/Thoughtseize, it made sense to run it. Plus it helps out against Ichorid.
Mana Drain
Read the Runes, Mulldrifter, and Cunning Wish I have plenty of Drain outlets. I mainly like this because I can threaten a Mana Drain with it in my deck. Read the Runes, Cunning Wish, and cycling a Clear give me legitimate instant speed options if no good target comes up.
Clear
It cycles under 9spheres or any deck that doesn't run enchantments. And it gives me 4 main deck outs against Leyline of the Void. As a bonus it hits Oath.
Thoughtseize
This card is particularly important because I cut Bazaar so I had fewer ways of getting rid of a Dragon.
Snuff Out/Slaughter Pact
Which to play. 4 life can be hefty on top of everything else, but Snuff out does allow for the instant turn around with a Animate. Slaughter Pact would push you back a turn.... Snuff Out can't deal with Magus though.