@Drain life: How are you abusing the Nim deathmantle, I get how to bring back non-token creatures for 4 mana. I just want to know how you break the card.
Also, how often has this card saved you? It works wonders with Omnath, but I have yet to see it shine in here.
(1) I just put my fodder up to 15%, some I threw out a lot of combo and utility. The reason I did this is because my games were very clunky, so I cut out everything I did not essentially need. After I play test some more I can add in the other win conditions.
(2) I would still keep Extraplanar Lens, it helps with mana at least. Or at least make its replacement a mana doubler of some sort.
(1) 27 creatures is still good, its near a third of the deck. It depends on how much of those creatures are for fodder and how much are used for combing with another card. I recently had an issue where I had to manny combo creatures that I did not want to sacrifice, which slowed me down in producing zombies.
You should have at minimum 10% of your creatures dedicated to fodder, in my opinion.
(2) The older versions of snow-covered swamps are cheaper than the later version, I remember that much. Honestly, I would keep them as regular swamps and enjoy both the Strata Scythe and Extraplanar Lens.
When your ready to make the switch you can, its not like you gain that much advantage by locking opponents out of extra mana. Plus, if another opponents extraplanar lens and regular swamp than you get the bonus still too.
(1) If you don't like Lashwrithe and your worried about which version of swamp will give you a bonus, then I would keep Nightmare Lash. It only counts "swamps", so it wont matter if they are snow-covered or not.
(2) I have a rule of not telling people what to cut, but I will say I think its ok that you might cut Overseer of the Damned. Here is a link to my tappedout deck, you can look at the hash tags to see how I organized the cards. This may help you determine what to cut.
(3) Strata Scythe is a nice piece because has the chance to count all of lands on the battlefield. That being said, are you willing to give up the benefit of maximizing Extraplanar Lens? If you go with basic swamps then you can maximize the use of Strata Scythe, but you lose the potential of Extraplanar Lens. If you do go with snow-covered then Strata Scythe is only exceptional when you face another snow-covererd swamp opponent.
door of destinies is a great combo piece. It can be slow, but with the right card it can get out of hand quick. This is a flavorful one, but its not a must have.
Junkyo Bell can be dead draw if your commander is out of action. It goes along with your other equipment pieces, they are just as easily dead draw if you don't have a ghoulcaller gisa out on the field.
Also, how often has this card saved you? It works wonders with Omnath, but I have yet to see it shine in here.
I would have picked any of these to replace it:
Here is how I would list your cards to help out with tweaking the deck:
1 Gravecrawler
3 Fleshbag Marauder
3 Unbreathing Horde
4 Filth
4 Risen Executioner
4 Solemn Simulacrum
5 Gray Merchant of Asphodel
6 Massacre Wurm
Utility
1 Carrion Feeder
3 Fleshbag Marauder
3 Gutless Ghoul
4 Grave Defiler
5 Gray Merchant of Asphodel
1 Tragic Slip
2 Malicious Affliction
2 Nameless Inversion
3 Sudden Spoiling
4 Sever the Bloodline
5 Crux of Fate
5 Syphon Flesh
7 Necromantic Selection
2x Exsanguinate
2x Profane Command
4 Grave Pact
5 Dictate of Erebos
5 Palace Siege
3 Contamination
3 Burnished Hart
4 Crypt Ghast
4 Solemn Simulacrum
1 Expedition Map
1 Sol Ring
1 Wayfarer's Bauble
2 Charcoal Diamond
2 Jet Medallion
3 Extraplanar Lens
6 Caged Sun
1 Cabal Coffers
Anthem
3 Adaptive Automaton
3 Cemetery Reaper
3 Death Baron
3 Lord of the Undead
4 Undead Warchief
4 Nightmare Lash
6 Caged Sun
6 Obelisk of Urd
Tutor
5 Corpse Harvester
Combo
2 Blood Artist
2 Shepherd of Rot
3 Zombie Master
4 Filth
4 Vengeful Dead
5 Gray Merchant of Asphodel
5 Noxious Ghoul
6 Gempalm Polluter
1 Altar of the Brood
2 Thornbite Staff
6 Gravespawn Sovereign
4 Hell's Caretaker
2x Wake the Dead
3 Victimize
9 Rise of the Dark Realms
2x Profane Command
draw
4 Solemn Simulacrum
6 Gempalm Polluter
4 Syphon Mind
This is just a basic template.
(2) I would still keep Extraplanar Lens, it helps with mana at least. Or at least make its replacement a mana doubler of some sort.
You should have at minimum 10% of your creatures dedicated to fodder, in my opinion.
(2) The older versions of snow-covered swamps are cheaper than the later version, I remember that much. Honestly, I would keep them as regular swamps and enjoy both the Strata Scythe and Extraplanar Lens.
When your ready to make the switch you can, its not like you gain that much advantage by locking opponents out of extra mana. Plus, if another opponents extraplanar lens and regular swamp than you get the bonus still too.
(2) I have a rule of not telling people what to cut, but I will say I think its ok that you might cut Overseer of the Damned. Here is a link to my tappedout deck, you can look at the hash tags to see how I organized the cards. This may help you determine what to cut.
(3) Strata Scythe is a nice piece because has the chance to count all of lands on the battlefield. That being said, are you willing to give up the benefit of maximizing Extraplanar Lens? If you go with basic swamps then you can maximize the use of Strata Scythe, but you lose the potential of Extraplanar Lens. If you do go with snow-covered then Strata Scythe is only exceptional when you face another snow-covererd swamp opponent.
door of destinies is a great combo piece. It can be slow, but with the right card it can get out of hand quick. This is a flavorful one, but its not a must have.
Junkyo Bell can be dead draw if your commander is out of action. It goes along with your other equipment pieces, they are just as easily dead draw if you don't have a ghoulcaller gisa out on the field.
These are cards I am using in my deck at the current moment.
Those are excellent suggestions. Here is the deck so far:
1x Armillary Sphere
1x Black Market
1x Burnished Hart
1x Cabal Coffers
1x Caged Sun
1x Crypt Ghast
1x Extraplanar Lens
1x Liliana of the Dark Realms
1x Magus of the Coffers
1x Myriad Landscape
1x Nirkana Revenant
1x Nykthos, Shrine to Nyx
1x Phyrexian Altar
1x Sol Ring
1x Solemn Simulacrum
1x Wayfarer's Bauble
Anthem (7)
1x Caged Sun
1x Cemetery Reaper
1x Death Baron
1x Door of Destinies
1x Eldrazi Monument
1x Mikaeus, the Unhallowed
1x Undead Warchief
Reanimation (7)
1x Geth, Lord of the Vault
1x Hell's Caretaker
1x Lord of the Undead
1x Mikaeus, the Unhallowed
1x Mimic Vat
1x Nim Deathmantle
1x Unholy Grotto
Control (4)
1x Black Sun's Zenith
1x Bojuka Bog
1x Grave Pact
1x Skinrender
1x Altar of the Brood
1x Blood Artist
1x Door of Destinies
1x Gempalm Polluter
1x Geralf's Messenger
1x Gravecrawler
1x Hell's Caretaker
1x Phyrexian Altar
1x Shepherd of Rot
1x Thornbite Staff
1x Umbral Mantle
1x Urborg, Tomb of Yawgmoth
1x Vengeful Dead
1x Zombie Master
1x Zombie Trailblazer
Land (35)
1x Bojuka Bog
1x Cabal Coffers
1x Ghost Quarter
1x High Market
1x Myriad Landscape
1x Nykthos, Shrine to Nyx
26x Snow-Covered Swamp
1x Terminal Moraine
1x Unholy Grotto
1x Urborg, Tomb of Yawgmoth
Tutor (6)
1x Beseech the Queen
1x Buried Alive
1x Demonic Tutor
1x Diabolic Intent
1x Diabolic Tutor
1x Jar of Eyeballs
1x Hell's Caretaker
1x High Market
1x Infernal Tribute
1x Phyrexian Altar
Fodder (13)
1x Geralf's Messenger
1x Grave Titan
1x Gravecrawler
1x Korlash, Heir to Blackblade
1x Nether Traitor
1x Nim Devourer
1x Phyrexian Dreadnought
1x Reassembling Skeleton
1x Skinrender
1x Solemn Simulacrum
1x Soulless One
1x Stromgald Crusader
1x Unbreathing Horde
Draw (6)
1x Gempalm Polluter
1x Graveborn Muse
1x Infernal Tribute
1x Necropotence
1x Phyrexian Arena
1x Skullclamp
Utility (6)
1x Endless Ranks of the Dead
1x Illusionist's Bracers
1x Lightning Greaves
1x Rings of Brighthearth
1x Swiftfoot Boots
1x Thousand-Year Elixir