MrBarrelRoll

I think you could use some removal. Try Lux Cannon, pretty much perfect for a deck like this.

That said, adding some Voltaic Keys could also be rather helpful, since so many of your artifacts have tap effects.

Looks pretty kickass, though in my experience with this the Scute Mobs never really work out all that well, they eat removal too easily before their ability can even go off. If you can afford them, I'm thinking Lotus Cobras would be a lot better for the insane accel the provide. Turn 3 Admonition Angel = YES.

Also consider using some of the zendikar and worldwake lands that have 'enter the battlefield' abilities. With Ruin Ghost you can gain a lot of functionality with those.

I have two G/W landfall decks posted myself, feel free to check them out for some more inspiration

Yeah you can proliferate pretty well, but you're kind of lacking things to use that proliferation WITH.... Other than -1/-1 counters with Infect of poison counters, you don't have much to use it. That's only 6 cards out of the deck.

Suggestions: Planeswalkers, Everflowing Chalice, Protean Hydra, Avenger of Zendikar (a particularly fun one), Eternity Vessel, Beastmaster Ascension (or any Quest card really)... hope that's enough for at least some inspiration!

I'm thinking Fireballs, in case you manage to pull off that infinite mana combo.

Use Crab Umbra.

Crab Umbra + Harabaz Druid = infinite mana if you have at least 4 allies out.

USE TECTONIC EDGE.

That with Sun Titan can give some of the most unfair land advantage evar.

Steppe Lynx is there for early damage. The lands you listed are there to pull out with Primeval Titan and then bounce with Ruin Ghost to get both additional landfalls and to get the effects they provide more than once, like I said in my description. Pretty much goes like this:

Ruin Ghost + Halimar Depths = Sensei's Divining Top
Ruin Ghost + Sejiri Steppe = Mother of Runes (lets me give instant speed protection against removal, ie Bolts)
Ruin Ghost + Bojuka Bog = reusable Tormod's Crypt, lets you remove Eldrazi Legends at instant speed

Garruk is there for additional accel as well as for the overrun ability.

Suggestions: Basilisk Collar to turn Gelectrode into handy point removal, Burst Lightning instead of Shock, also USE SEARING BLAZE!!! It's great, especially in a deck like this -- if Pyromancer's Ascension is off, you can kill 2 creatures and deal them 6 damage!

Last thing I can think of, consider replacing something to run Time Warps. With Pyromancer's Ascension that's kind of nuts.

Kederekt Leviathan seems kind of ew since all of the mass polymorph guys enter simultaneously.

I say just stick with the big 3 for a deck like this: Iona, Emrakul, and Stormtide.

I'll be honest in saying that Mass Polymorph can be a lot of fun for ally decks of these colors. A few Join the Ranks beforehand to generate tokens can mean massive creature advantage later.

You guys are insane.

and AWESOME.

You need removal other than just Royal Assassins. Jace's Erasure and Tome Scour are dead cards, they'll never kill your opponent before damage from the idols would. That said, blue is pretty much a dead color in this deck, might be better off simply as black/white.

Some ideas:
Duress/Inquisition of Kozilek -- get things out of their hand before it's ever a problem
Journey to Nowhere -- excellent creature removal without a 'nonblack' clause

I think this would do better simply as a blue/green deck. All Brood Birthing will do is let you get more spawn tokens than creatures, which isn't really helping anything.

For green use Growth Spasm to get more spawn tokens, and in blue I'd suggest Wind Zendikon. 4x Growth Spasm, 4x Wind Zendikon, 4x Awakening Zone and 4x Khalni Garden should be more than enough creature generation.

And maybe consider a few more polymorph targets as well. If you want some hilarity with Stormtide Leviathan, try Wrexial, the Hidden Deep.

I would maindeck the Deprives versus Autumn's Veil, since you can bounce your Khalni Gardens and get even mroe tokens when you replay them. Autumn's Veil is made to live in sideboard anyways, no point having a card that'll be dead 60% of the time.

Also one SOM rotates in, try and find some Chimeric Masses -- they're an artifact that can animate into a creature for 1, perfect for this type of deck!

Seismic Assault decks work better when they run Seismic Assault. :D

That said, run Swans of Brynn Argol. That'll let you draw up your deck in no time, since you can discard one land to hit the swans for 2, which lets you draw 2 more cards, repeat until all the cards in your deck are in your hand, then discard them all to make your opponent implode.

Looking good, but maybe add in some removal. 4x Journey to Nowhere can make all the difference.

Looks like Chandra's Spitfire would be awesome.

Also some Whispersilk Cloaks, to make your hyper-pumped creatures avoid chump blockers.

So much fun, reminds me of my first serious 'combo' deck I'd ever came up with, that combo being Gelectrode with some Deathtouch equipment. Tons of fun to be had with that one.

So I gotta recommend some Basilisk Collars or at least Gorgon Flails. 4x Gelectrode and 4x Gorgon Flail and you can do dirty, dirty things.

I'm thinking Howling Mine / Font of Mythos would help too.

Then add some Darkness for a nifty variation on Turbofog!

Kor Spiritdancer?
Aura Gnarlid?