This deck is the second version of this deck, the first one is linked below.
http://www.mtgvault.com/mlw/decks/phyrexian-solemnity/
After playtesting this deck for about six monthes, I realized that most of the one mana creatures in my deck weren't doing anything. But, I also noticed that my deck had a lot of spirits, so I decided to make Phyrexian Solemnity a spirit tribal deck, as well as an infinite combo deck.
On to actually explaining the deck. The basic idea of this deck is to get either Phyrexian Unlife and Solemnity out, to make it so your opponent can't kill you with damage, or Solemnity and Blasting Station, plus a creature with undying or persist, to deal a lot of damage to your opponents face. Drif of Phantasms can tutor for your combo pieces, and also is a spirit, which is nice. Mausoleum Wanderer is, A, a spirit, B, can become a huge threat, and, C, can protect our combo pieces, since most enchantment/artifact removal is a sorcery or instant. Rattlechains is there to protect our creatures, as well as give us the ability to flash most of our creatures out. Safehold Elite and Stormbond Geist enable the Solemnity and Blasting Station combo to happen. Spell Pierce is mainly in the deck to protect our combo peices. It's pretty obvious what Mana Leak, Drogskol Captain, and Supreme Phantom do in the deck. Spell Queller is just there to act as a general nuscience. Harm's Way and Gideon's reproach work as removal, and Harm's Way also works as a combat trick.
For the sideboard, Relic or Progenitus is graveyard hate. Kataki is there to annoy artifact affinity decks :). Vapor snag is just for more removal for aggro decks. Fragmentize is to deal with graveyard hate, because that disables a part of my deck. Spell Pierce is for an extra counter to burn and mill, as well as a counter to removal heavy decks. Amulet of Safekeeping is my main counter to mill, burn, and token decks.