Lepellier

Brave the Elements would work pretty well there.It still won't protect from DoJ, but using it for an alpha strike when you have pro whatever color your opponent is is nice.

Kalastria Highborn would be BEAUTIFUL in here. It's only a 2 drop, and can help you regain life whenever a Vamp goes to the graveyard. And even better, it combos out with Viscera Seer.

Sorry to burst your bubble, but Safe Passage does not protect your creatures from Day of Judgement.

I wouldn't even worry about the blue mana if all you're running it for is Tezz's Gambit. Since you can use the Phyrexian Mana and it's the only blue in the deck, I'd just add in 2 more basic lands. However, you could also turn that idea around and use Creeping Tar Pits, add in a few more sources of blue mana, and use that as an ensured way to get the 2 damage across a turn. (Well, 3, but still.)

Personally, I'd say drop to 2x Livewire Lash, 2x Corpse Cur and run 4x Plague Myr.

Also, take out the Terramorphics and Evolvings for more basic lands, and maybe put in a few contested war zones.

I agree with the landfall. I'd say drop it. Drop the Lynx, Geopede, and Adventuring gear. I'd toss in 1 more Journey to Nowhere, trade out the Spikeshot Elder for another Goblin Guide, and possibly throw in a few Accorder Paladins and/or Goblin Wardrivers or Signal Pests. This makes for a very powerful, aggro-centric deck.

I'd drop 2x Skithy (Too expensive for a fast deck), add in 2 more Plague Myr (Mana ramp in a quick deck is really good), probably drop 2x Contagion Clasp and 2x Steel Sabotage for 4x Ichorclaw Myr (They become 5/5's that get bigger when blocked? Yes please), and probably do either 2x Duress/2x Inquisition of Kozilek, or just 4x Inquisition.

It's the 3rd one that you linked to, if you want to remove the others.

Veronique Meignaud's full art Swamp from Zendikar. :D Not many people have a land as their favorite art, but I do!

Ezuri, Renegade Leader, Vampire Nocturnus, and several zombie cards (I.e. Cemetary Reaper)

Personally, I think that you kept the wrong Myr in the deck. I would much rather have Plague Myr than Ichorclaw. Sure, Ichorclaw is a tough little 1/1, but the extra mana you get from plague Myr makes up for that when it comes to getting off another spell a turn, or casting Skithy a turn earlier.

Actually, I do agree. I had completely forgotten SiB, and it would be really useful as a card draw engine and can be that last 2 damage I need to set off the ascension.

Also, Rhys the Redeemed, Rhys the Exiled, and Glissa are all invalid cards in a mono-green EDH, since they all have mana symbols of other colors.

If you're looking for suicide, run Verdant Catacombs instead of the Evolving wilds. It's 1 life loss AND the land doesn't come into play tapped.

You may want to add in a few black mana to cast Glissa. I know you probably plan on using GSZ to pop it, but you have a chance to pull it to hand, and so the mana would be more useful. Probably run 2-3 swamps and a playset of Verdant Catacombs.

Depends on what you're going to take out for them, but I like the idea.

I think you may be better off using a single darksteel relic and 4x Trinket Mage to fetch it up. That way, you can ensure that you have your artifact a little bit better, plus, you don't lose a land in the progress if something happens to your Blightsteel. It also gives you better mana base. However, if you really want to ensure it, I guess you could do 1x Relic and 4x nexus. The chances of you hitting the relic instead of a blightsteel are slim if you S.A. one of the Nexus'. Also, think of possibly using Chained Throatseeker for the 5/5 beast of an Infect machine. And maybe run steady progress or Viral Drake. Both are decent sources of proliferate, and S.P. is an extra card draw, while the Drake is another Infect creature with evasion.

Same goes for Esper Stormblade and White.

Grixis Grimblade is illegal in this deck, as it has Red in the mana cost. Not that he's hard to replace, but still.