I built this a while ago and have had a fair amount of time to test it out. The deck works pretty slick and has plenty of tutors and transmute cards to get you almost anything you need. I recently added Storm Cauldron and it has been pretty good. Then not long after I stumbled upon Tainted Aether and it has been really good and when combined with Storm Cauldron it is pretty annoying. I can pretty much win with Ob Nixilis with both out unless someone has a lucky answer. Tainted Aether is really good against token decks and often people will try and play around it for some reason. I have also really liked the interaction between Walking Atlas and Ghost Town.
If you play the deck don’t forget the best things to have out are Urborg to make your fetchlands tap for mana and you can save them up, crucible of worlds, and Rings of Brighthearth. Don’t forget that Rings can copy transmute. Ob Nixilis can pile on the damage and wound reflection can end games pretty quickly. I have found myself tutoring for Walking Atlas a lot as well. I have killed people numerous times out of no where with General Damage via Ob Nixilis (the +1/+1 counters pile up fast).
I took out Tainted Strike but I had an epic play with it that involved ending an almost 3 hour game no one could win. Everyone was close to 100 life except me, I was at 9, so I played Thrashing Wumpus, tainted striked it and activated it 10 times to end the game. No one complained surprisingly.
I like the ability to cast and use wumpus right way to wipe the board. The Pestilence Demon is good though.
Exsanguinate is in the deck. I must not of had an updated list when I typed this in. Not sure what I took out for it. I use to have all the drain life things but now I only run Ezsanquinate and Profane Command. A lot of times games do not last long enough for the black x spells to be relivant. With the two in the deck i can always tutor them up.
I'll keep rain of filth and bubbling muck in mind.
I need to look through New Phyrexia and figure out what to add to the deck.
The deck is fun to play and people underestimate how much damage the landfall can pull off. One time in a 3 Player Game it went like this.
Turn 1: Urborg, Tomb of Yawgmoth, Sol ring, Walking Atlas
Turn 2: Mirage Fetchland, Walking Atlas a Swamp, Phyrexian Arena, Wayfarer's Bauble
Turn 3: Cabal Coffers, Walking Atlas a Onslaught Fetchland, Ob Nixilis, Tainted Aether (unfortunately didn't do anything really)
Turn 4: Onslaught Fetchland, Walking Atlas Panarama, do 6 to Player 1, tap coffers for 7 play Rings of Brighthearth (last card in hand) rings the 2 Onslaught Fetchlands, 12 Damage to Player 1, Rings the Mirage Fetchland, 6 damage to Player 1, Rings the Wayfarer's Bauble, 6 damage to Player 1, Activate panorama, 3 damage to Player 1. Swing at Player 2 with Ob Nixilis with 33 +1/+1 counters for almost straight up 40 leathal (over kill for General Damage) to kill him. Player 1 is around 5 life and dies horribly the next turn to a panorama.