Not sure what your options are on planeswalkers, but I was looking at a similar deck that counts on the creatures I drop being resilient against board-sweepers. At the very least, you need some Day of Judgement effects to take advantage of the Knight Exemplar's benefit. Some preordains and big daddy jaces would work well too. The deck I built goes in for elspbeths and gideon juras as well, because right now they're some of the strongest control/threat options white has My take on a similar theme:. http://www.mtgvault.com/ViewDeck.aspx?DeckID=143062
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I'd add in four Inkmoth Nexuses, and I don't think you're necessarily playing the strongest infect creatures available. You might want to consider less evasion cards (i.e. tangle angler, infiltration lens, etc) and just put in a couple of skithiryx's and phyrexian crusaders and a couple removal spells. Additionally, I'd swap out the putrefaxes for vatmothers, and just sideboard them if you happen to be playing another infect deck (the only real time their drawback is a drawback). Ultimately I'd suggest: -2 Rot Farm -2 Terramorphic Expanse, +4 Inkmoth Nexus -3 Putrefax -1 Dusk Urchin, +4 Phyrexian Vatmother -2 Infiltration Lens, +2 Skithiryx the Blight Dragon -2 Tangle Angler, -2 Rot Wolf, +4 Phyrexian Crusader -2 Prey's Vengeance, +2 Vines of Vastwood -4 Livewire Lash, +4 Go for the Throat Then again, that's a pretty massive overhaul - in the end, I just prefer black infect creatuers and removal over equipment and green. To each their own!
I'd suggest vatmothers over corpse curs. Trading a sometimes-useful sometimes-not secondary ability for what amounts to an 8/5 four-mana creature with a negligible downside seems like pure upgrade. Sideboard them out on infect matches for your Hand of the Praetors. Also, a couple Vampire's Bites could help for that surprise pump-win. Ultimately I'd suggest: -2 corpse cur, -2 ichor rats, +4 vatmother -3 Grasp of Darkness, +3 Vampire's Bite And, if you have fetchlands to support it: -1 Sword, -1 Sign in Blood, +2 Adventuring Gear
Man, I *want* to remove the adventuring gears... but it works so well when it works! Turn 1 gear, turn 2 plague stinger, then come turn 3 you attach the gear and, assuming two fetch lands in your first 10 or 11 cards, drop fetches on 3 and 4 and just sit on your mana and leak or throat anything that hits the table. It's a turn 4 win *with* the ability to throw down a counter and a clear card if needed. Maybe -1 Skithiryx, -1 Jace, +2 Distortion Strike. MAYBE -2 Adventuring Gear. I have to get this put together on Friday and try running it awhile and see how often those gears make it or break it.
I've had an amazing amount of luck with Adventuring Gear... to the tune of using it to hit with a plague stinger for 9 on round 3. Often I can drop the gear on round 1, the stinger on round 2, attach on round 3, drop a land, fetch, play explore, drop another land, then use a pump spell and win round 3. It's often worth +4/+4, occasionally worth +6/+6 or +8/+8, and its fast. I'd sideboard out the Vatmother against infect, and if I really have to, I can GffT her as well as anything else - but it'd realistically be round 14 before I die to infect without being up against another infect player, and if it's that late, I've already lost. It is light on early creatures, though. I think a few Blight Mambas or Septic Rats might find a home to round out the early mana curve. I could potentially ditch the Explores and Adventuring Gears and fetchlands and just stack up four more creatures and two more pump, and see how that worked.
You probably want a couple Ichor Rats - proliferate does you no good until you actually get that first poison counter on, and the Ichor Rats provide it without ever having to hit him. Also, I'd put in some Inkmoth Nexuses. Carnifex Demon is a crazy creature with proliferate - you can keep adding more counters to him, then remove them to give everything else counters. Finally, Ob Nixilis uses counters, and he is, in my opinion, one of the most underappreciated creatures around.
First, add in Vatmothers... they beat the hell out of Hands of the Praetor any day. Second, I'd swap out Putrefax for the Phyrexian Hydra. Three ratchet bombs and two black sun's zenith seems like too much global removal for a deck that should have creatures out early - swap in some Go For The Throats or Doom Blades instead. Finally, I'd sideboard Virulent Wounds - I really only see that being useful against decks that have 1/1 and 2/1 creatures, and you'd rather have a fourth Phyrexian Crusader and a couple more Vatmothers or Hydras running around.
Ditch the Chalice, put in four Inkmoth Nexuses. Those can be your artifact to sacrifice, and don't trigger when you go searching for it with Shape Anew. You also might want to consider Master's Call, if you can fit in white, as that likewise creates artifacts without being an artifact itself. Ditch the Trinket Mages - there's only one card they can pull, and that shouldn't be in there at all - and put in a couple board sweepers, like Consume the Meek or Black Sun's Zenith (or Day of Judgement if you go white). Also, for protecting the big guys, Not Of This World is pretty tough to beat, as it's free to counter anything targeting the Colossus once its in play.
I'm not a huge fan of Llanowars. What about using Lotus Cobras instead? With the Adventuring Gears and Harrows, you're already playing towards fetch lands and multi-land drops. Also, a couple Explores might go well. I tend to prefer them to Harrow, as when they're countered you don't lose a land. Other than that, I like how it looks. ;)
I'd suggest a couple Sphere of the Suns over Mox Opals... get up and going quicker, and by the time they're out of charges you can use Tezzeret to make 'em creatures. Also, I like Inkmoth Nexuses for their ability to become 5/5 flying infecters with Tezzeret. Maybe replace a Darksteel Axe or two with Sword of Feast and Famine? Creeping Tar Pit is unblockable, and that'd be a quick way to work up some mana while forcing discard. Finally, I'd consider sideboarding the Spreading Seas for a few more artifacts, maybe a few Walls of Tanglecord and either a Tumble Magnet or Wurmcoil.
Any infect deck should have four Inkmoth Nexuses in them. Also, you may want to consider a Corrupted Conscience or two.
Personally I've found going with adventuring gears and explores, then with a few fetch lands, are powerful combination. I'd say -4 Birds of Paradise, -3 Signal Pest, +3 Adventuring Gear, +4 Explore. It adds in even better with the Harrows. Additionally, you may want to consider replacing an Overhelming Stampede and two Unnatural Predations with three Vines of Vastwood, which both protect your creatures and provide solid pump.
I'd suggest more Inkmoth Nexuses. Those guys are crazy good. Say, sub out two Ichorclaw Myr for two more nexuses. When you need the mana, they can help you get things like the Hydra out, and when you don't, they're flying artifact infect that can't be hit with Go For The Throat.
I'd still say it's best to stick with the wurmcoils, due to their resilience vs. day of judgement and their lifelink helping against quick aggro/burn decks. I think I'd have to play at least 4-5 creatures to justify a frost titan lineup.
Another Wurmcoil, or do you think a Frost Titan for control might be better? They work very well with Venser.