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Treasure mage only has two targets? You'd be better off with a fabricate IMO.

You have way too many cards in the deck.

Oona is not mono blue and is illegal in the deck.

Laboratory Maniac is a wizard and an obvious win condition/defense for a draw deck.

Turnabout is an awesome control card or enables a bunch of extra mana or draws.

Opposition would be good as well for control making your swarm of wizards into tap engines so that you can actually get through for damage when you're ready to swing.

It's been a while since I've seen a lot of these cards played. Pretty nice.

You have to have better options than the CoP cycle though, even if it's just 8.5 tails, fogs or giving yourself shroud/hexproof. There's a good chance that any of them will be dead draws and the effect isn't that relevant.

Gift's Ungiven is banned.

You seem to be missing lands...

There's a lot of new stuff in Gatecrash that will do wonderful things with Mimeoplasm.

Was worth asking... $900 deck usually suggests the player has the budget for a dual land. I'm seeing several cards that are before modern going back as far as Ice Age or maybe further but it's totally understandable. Most my EDH decks are $1-300 so it's all good.

The new Sylvan Primordial would be a good (albeit expensive) target for Green Sun as well but Acidic definitely belongs here.

Perhaps the white auras that grant double strike or protection from creatures. Things like Eldrazi Conscription are good but they still put you on a two turn clock for 8 mana when you could give her double strike for 3(?) mana and then a random buff puts them on a two turn clock still. The Paladin already grants double strike but a little redundancy doesn't hurt.

As a side note, I believe my Ob Nixilis deck could kill this (per your deck title) or at least hit you for 21 general first. Still looks like a strong deck though.

He phases in, along with all the lands, then his upkeep trigger phases out the lands and in response to that, you activate vanishing again. They will have their lands during their upkeep only.

Bronze Bombshell is too weak. It will hit someone for a fraction of their life and put a target on your head but it won't actually hurt them enough to be relevant. I'm not seeing any easy way to recur it so it's basically 7 damage for 7 mana which is pretty terrible in multiplayer.

Taniwha + Vanishing can permanently phase out a player's lands. It could also protect your general or anything else you don't want removed.

Delusions of Mediocrity is not Illusions of Grandeur. You need the real thing. Even blinking it with Venser, you need the real thing. Include both if you want but Illusions is far better.

The black lotus and mox jet/pearl are banned in EDH.

Manalith is really bad. Grab a Sol Ring, Orzhov Keyrune or Signet over it. Worst case use Darksteel ingot instead.

One board wipe isn't really enough with the high CMC of this deck. You'll get overrun before you can cast any threats and without a decent number of wrath's you will not be able to stabilize.

You should get a Quicksilver Amulet or something to cheat these big creatures into play or even a Living Death.

You need a sac outlet/Homeward Path because with all these fat creatures, an insurrection effect would ruin you.

You have no card draw. Black has awesome card draw available.

No Savannah?

Indestructibility is bad. Austere Command will still kill Sigarda with that in play. Perhaps Ghostway or Flickerform... They will protect her from exile/tuck effects as well.

There's only ~7 targets for Green Sun's Zenith and none of them are really that interesting... Is it really worth the spot when Woodfall or EWitness are the only worthwhile targets in the deck?

With only 8 plains in the deck total, is it really worth including Emeria?

You're missing Tandem Lookout as a third combo piece. Riptide Shapeshifter would be able to tutor it into play naming scout at instant speed. It could also tutor up several others like Jin for added control.

Flusterstorm, Wasteland, Desertion, and Capsize are not from foiled sets... Judge foils?

You definitely need a way to protect your general like Lightning Greaves.

Insurrection is just a good stuff inclusion that is completely off theme, you can easily cut that.

I like the concept but it is currently weak to counterspells, fogs or something like Rakdos Charm to just kill you with your 20+ creatures in play.

Maybe a few Judge's Familiars to defend once you start going off, one Elixir of Immortality to reshuffle if you get countered or fogged and a free sac outlet (Bloodthrone Vampire?) if you need to lower your creature count...

Get rid of the Reliquary Towers... You have no use for no max hand size. You should never have more than 7 in your hand with only 4-6 draw spells in the deck and such a low curve. An extra blue source would be more important.

You need an answer for Eldrazi/Elixir of Immortality reshuffle or graveyard strategies. Whether it's Jace's Phantasm (instead of fog bank) as an alternate win in case milling is not possible, a Trickbind/Stifle to counter the shuffle effect or Tormod's Crypt to exile the yard in response. The correct choice would be meta specific.

The deck would really be improved by getting rid of the Terramorphic/wilds and replacing them with Onslaught/Zendikar fetches although that would be rather expensive... Crucible is definitely a powerful additional as well to combo with the fetch lands and crabs.

As a tournament deck, this is too slow. You have no card draw and very little card advantage (There's not enough cascade in the deck to really make that a large theme). A lot of your lands come in tapped or fix tapped which will hurt you a lot. Without an uber expensive land base that is hard to fix short of using the cards that grant all basic land types or giving it a heavier green focus and running a lot of ramp.

I would suggest Godhead of Awe for any sliver deck... You force their creatures to be 1/1's while most of yours already are and will be much bigger from the other sliver effects anyway.

Mana Echoes goes infinite with sliver queen or is just an otherwise powerful colorless source.
Minion Reflector is good to get some added value from your important slivers or just to give you tokens to sac for other abilities.

You need some form of wipe protection. Ghostway or similar effects would be good or even the new Boros Charm when Gatecrash becomes legal tonight. Recursion wouldn't hurt either, there's a lot of board wipes in EDH and some of your slivers are pretty important to have out. Wheel of Sun and Moon would put all your slivers back into the library to tutor back out.

No Stuffy Doll?

Added a Goblin Welder instead. I originally intended to have him in but ran out of space and wasn't sure how relevant he would be. The added recursion is definitely good though.

Insurrection is a dumb one card "win out of nowhere regardless of previous game states" spell. I can already replicate the effect with Radiate + Act of Treason and that win actually requires more than one card. Similarly with Charisma on T&L + any red spell gives me control of all non-flying creatures so there really is no need for an 8 mana good stuff inclusion. Also, Shattering Spree has almost no synergy with the general, the copies of the spell are placed directly on the stack so they do not trigger casting a red spell.

The mana base is rather simple and could definitely be upgraded but it's not bad. I do not want to add more artifacts since the deck relies upon casting colored spells. I have never had problems hitting land drops, shuffling your hand and drawing more cards every few turns gives it a very high probability of hitting land drops. I currently have 6-7 lands that come into play tapped (I just noticed I forgot to include the vivid lands). Adding more budget options that also come in tapped will just end up slowing the deck down unnecessarily. It is a two color mana base with only a few spells requiring more than one of a specific color, it's not super hard to meet the color requirements by the time I get to the CMC of any spell. I build all of my decks to run with around 34 lands. It is a personal preference and it works very well for me. Card draw is generally better at helping you hit land drops than including more lands innately and is otherwise more beneficial to helping you avoid top decking.

I don't really agree that the strategy is too muddled, a deck that is too streamlined is very easily countered. The "focus" of the deck is punishing greed with chaos and it does it by copying too powerful of spells, stealing too powerful of permanents and punishing too much tutoring or draw. While it does appear to be going down several paths, they're all linked in the same theme. Niv-Mizzet is certainly a good stuff inclusion but I just added him for testing since he does have a fair amount of synergies within the deck. Psychosis Crawler is a great win condition in the deck, Niv is a slightly weaker version of that but does other things.

The purpose isn't just to control the board by chaining red spells, with flying creatures and big creatures that are common in EDH, that is not probable and there is not enough draw or spells in the deck to pull that off without an infinite combo. If I need to wipe, I can equip deathtouch. The damage is intended to kill utility creatures, control the early game and set up a better position going into the late game with things like Cowardice or Charisma so every spell I cast becomes a two for one (or better).

Picked up the Izzet vs Golgari Duel Deck and am making the following changes. Some of the removed cards may come back after further testing...

-Levitation
-Nivix Guildmage
-Sphinx-Bone Wand
-Surrakar Spellblade
-Dual Casting

+Galvanoth
+Niv-Mizzet, the Firemind
+Djinn Illuminatus
+Wonder
+Nivmagus Elemental

It looks like I can access them today but they were down still yesterday.

Actually we can't... the news and challenges are pulled from the forums. The forums are down for us which is why we can't see the news or challenges pages.

Remaking Nate's Living Death deck with the challenge card that isn't really beneficial to the deck doesn't really fulfill the challenge IMO.

Fair enough... In draft, you can essentially do 1-2 Pack Rats and 39 swamps, mulligan til you find the rat and then win like 90% of games.