DedWards

I you're insistent on adding white, try make it an Esper (WUB) control-ish deck. White opens you up to cards like Oblivion Ring, Day of Judgment and other cheap ($ wise) removal. I also had an idea, if you add white, you could use Tempered Steel to make your infectors even bigger to deter opponent's bigger creatures. Shrine of Loyal Legions can produce a lot of blockers and/or fuel for Throne of Geth. I like Tezzeret's Gambit in this idea, but don't forget its lesser 'brother'; Steady Progress (more draw and proliferate can't hurt). If you're insistent on using the Contagion Engine I suggest taking it down to a 1 of and adding 3 Contagion Clasp. The Clasp is less impressive, but more reliable because it leaves more mana open for counter spells (and other spells). Lastly, I must agree that Inkmoth Nexus, Drowned Catacomb and Glacial Fortre should be a must, but you could also use Evolving Wilds or Shimmering Grotto.

Firstly, that card didn't exist when I posted this deck.
Secondly I'd not use it because it doesn't give full control over what attacks.
Lastly I abandoned this idea as I found red messes with what I ultimately wanted to do with this deck.

Cards like Contagion Engine and Inexorable Tide, though potentially powerful cards, look like they'll slow down the deck too much to be of any use (they both have high mana costs). Additionally splashing white for one card (Venser) seems silly to me.

Now I like the idea of poison + proliferate, but don't forget you've got metlecraft in here too. This makes me ask, why not use cards like Stoic Rebuttal? I'd also suggest Mirran Mettle, but that's an off colour. Talking about pump spells, there's one player in my group runs a mono black infect deck and she runs a set of Mutagenic Growth as she can pay 2 life to cast it and give an unblocked infector +2/+2. Additionally one of the 'tricks' she uses is to kill her opponent's first turn 1/1 with Virulent Wound. This would work wonders in this deck as it kills the opponent's 1st turn creature, it also starts the poison count for all your proliferate.

Oh ya, Cryoclasm and Sowing Salt make nice Sideboard Cards.

A few things I can suggest are to take the quantity of Stone Rain and Molten Rain up to 4, get a set of Avalanche Riders (and maybe Akki Blizzard-Herder), maybe use Seismic Spike, Poison the Well, Melt Terrain and / or Plunder and Dingus Egg. Molten and Stone Rain cost 3 each (the best cost on a LD card), the creatures are (imo) the better choice in creatures for LD, Plunder Suspends for 2 mana, Seismic Spike gives back 2 mana, Melt Terrain and Poison the Well deal 2 damage to the land's controller and Dingus Egg does 2 damage to the controller of any land that goes to the graveyard.

I like the idea of a Djinn tribal :) there are a few things I'd change though. I don't quite see Amoeboid Changeling being much use, so I'd replace it with Runed Stalactite. The Stalactite can give a small power and toughness boost to the Djinn, but it can also turn non Dijinn into Djinn to get the bonus Adaptive gives.

With the Djinn being so expensive (mana wise), I'd try work in Seething Song and Mindwrack Liege. Seething Song speaks for itself, but the Liege can do multiple things. It acts as a 'lord' and puts the Djinn into play for 4 mana at instant speed :D

Want to know a blue enchantment that combos nicely with Endless Ranks of the Dead? Paradox Haze. The amount Endless puts in is calculated in each of your upkeeps and haze gives you more upkeeps :p

I just commented for personal experience. The way I play, I've had no use for the regeneration either and I often don't have the mana open to use it.

You should try playing a set of Phyrexian Metamorph in here. I run a set in my UB build and last FNM I copied my opponent's Battleskull with 2 separate Metamorphs and equiped both to my Frost Titan without a Heartless out (that play won me the game).

Interesting build. I have an Elf Warrior deck and I've tried Ezuri, Renegade Leader. I found him more of a hindrance than help as I have always won or lost before I had enough mana to activate his built in "Overrun".

I'm tinkering with a BG Spirit deck and there's a few 'tricks' that I've attempted that may interest you.
1) I use Iname, Death Aspect to put spirits into my grave and then cast Living Death. Normally 4x Kokusho, the Evening Star is put into the grave and the battlefield. Living End can be cast off a cascade.
2) Shirei, Shizo's Caretaker could help retain your sacrificial sources, that means not using Long-Forgotten Gohei.

Dingus Egg mite help with the burn part

Hmmm... Ghoultree feels 'gimmicky' to me. The idea is nice, but it feels out of place.

You still need to increase the land count. Anything less than 20 lands is dangerous.

Actually, you can activate Heritage Druid's ability as many times as you want. All you need is 3 elves. If I have 9 elves out and one of them is Heritage druid, I can produce 9 green mana.

Take out some of the less useful cards (Contagion Engine, Decimator Web, Ghoultree, Lure, Genesis Wave, Triumph of the Hordes) for more lands. 15 lands is way too little for what you're trying to do here.

Additionally replace Grafted Exoskeleton with Livewire Lash. This change will give those pump spells an even better use as the damage Livewire Lash grants is done by the equipped creature. So an ifect creature with the Lash equipped that gets targeted will put 2 poison counters on target player before the spell doing the targeting resolves.

Personally I prefer Heritage Druid over Priest of Titania for two reasons:
1) It costs {1} less. This makes it come out sooner and / or use less mana.
2) Its mana production can be used the turn it enters the battlefield.

Elvish Harbinger helps big time in searching for the elf you want.
Have you thought of adding in some of the elf token production spells from the Lorwyn block?

I run a similar deck. I find Phyrexian Metamorph a little better than Phantasmal Image. It doesn't die as easily, nor can it be killed by Go for the Throat as it remains an artifact :p

An earlier version of this deck has faced off against Kor Firewalkers and won, just by siding in more burn :p As for counters to the deck, none I can think of :|

I haven't seen a need for cards like Mortapod, the Goblins die often enough for Brimstone Volley.

If you do face off against this, I'd like to know how it went.

As good as those cards may be, they're too expensive (mana wise) for what I'm trying with this deck. Anything above 3 mana is a no go and even 3 mana only if it is of specific use. The other problem with Hellrider is the fact that it's a rare. Rare's are not easy for me to get, especially 'Good' rares :(