Muktol

If he won't it's like a "Wasteland". And most people would search their library to compensate the lost land.
Furthermore most of the modern decks (even mono-colored, to reduce the possibility of drawing a land on later turns) play search-lands anyway, so "Ghost Quarter" is 'just' an emergency plan.

I've had "Sadistic Sacrament" on my radar, bu the the BBB costs scared me a little ;)

Some ideas and suggestions, based on 2 of my decks (http://www.mtgvault.com/muktol/decks/bw-paupervampire-sacrificing/ and http://www.mtgvault.com/muktol/decks/monob-sacrifice-2/)

I would concentrate on 2, maybe 3, sac-engines. If you use to many, you don't have enough creatures you can let them eat.
Furthermore I would change from "Altar's Reap" to "Read the Bones" or "Sign in Blood". The lifeloss is almost irrelevant if you use "Blood Artist" and you will have more creatures to sacrifice.
If you want to stop your opponents creatures from attacking you, I would remove "Blind Obedience" and add e.g. "Ghostly Prison"
"Immortal Servitude" can help to bring your dead creatures back...and sacrifice them again. "Driver of the Dead" does the same job, but only brings one cc2 creature back, though he can be sacrificed himself afterwards.

I hope I was able to help and give you some ideas
Greetings
Muktol

That was a rethorical question ;)
I know why many people play it. As for legacy (From what I have very little knowledge, most of it is "a friend of my friend said" and some rather sick cards) from what I have heard is that the games there can be incredible fast (T1 or T2 kill possible) and seeing a modern deck, even if it may be a rather fast (T3+ kills) one, beeing pushed into this legality by one cardchoice, hurts.

Greetings
Muktol

Why do all people use "Dark Ritual" as single legacy/ vintage card? When using legacy/ vintage legality I would take a look at some other cards from there too.

I would cut "Fog" and add some protection for your creatures, e.g. "Vines of Vastwood"
Furthermore I would add 2 more turors but reduce the number of finishers you use. At the moment you have 18 defenders against 12 finishers, which seems a little bit to much und the finisher side to me

Some suggestions, based on a quick card- search:
Carven Caryatid ({1}{G}{G}; 2/5; defender; when Carven Caryatid comes into play, draw a card), Thallid Shell-Dwelle ({1}{G}; 0/5; defender, At the beginning of your upkeep, put a spore counter on Thallid Shell-Dweller. Remove three spore counters from Thallid Shell-Dweller: Put a 1/1 green Saproling creature token into play), Wall of Vines ({G}; 0/3; defender, reach)
Sideboard:
Tree of Redemption ({3}{G}; 0/13; Defender {tap}: exchange your life total with Tree of Redemption's toughness.)

An alternative to "Green Sun's Zenith" (banned in modern) could be "Primal Command", "Time of Need" (when you work with legendarys) or "Tooth and Nail"

I hope I was able to give you some ideas
Greetings
Muktol

Some tipps and suggestions, based on my monoR Goblin deck (http://www.mtgvault.com/muktol/decks/monor-tribal-goblins/)
I would do a 4/2 split between "Goblin Chieftain" and "Goblin King". If you use "Blood Moon" you can do a 3/3 split, as "Goblin King" works very good with "Blood Moon"
I would remove "Bloodshot Trainee", "Ember Hauler" and "Goblin Balloon Brigade". The Trainee is rather unsure to activate (yes you have lords and "Quest for the Goblin Lord" but those will be the first target for your opponents), the hauler is a more expensive version of "Goblin Arsonist" (and cc2+cc1 for 2 damage is not a really good dmg/ mana ratio) and the Balloon Brigade is too expensive (you always have to keep one mana open to activate its ability)

Some suggestions to replace the removed:
Mogg War Marshal ({1}{R}; 1/1; when Mogg War Marshal comes into play or is put into a graveyard from play, put a 1/1 red Goblin creature token into play), Warren Instigator ({R}{R}; 1/1; double strike; whenever Warren Instigator deals damage to an opponent, you may put a Goblin creature card from your hand onto the battlefield), Goblin Wardriver ({R}{R}; 2/2; battle cry), Spikeshot Elder ({R}; 1/1; {1}{R}{R}: (No tap!) Spikeshot Elder deals damage equal to its power to target creature or player), Lightning Crafter ({3}{R}; 3/3, champion a goblin; {Tap}: Lightning Crafter deals 3 damage to target creature or player)

I hope I was able to give you some ideas.
Greetings
Muktol

"Cranial Plating" is banned in pauper, i stumbled over this too ;)
I would cut some creatures to add additional equipment, especialy when you use "Sunbeam Spellbomb" (4 'lost' slots for equipment)
Furthermore I would change from "Court Homunculus" to "Kitesail Apprentice" as it does basicaly the same (arifact on the table vs. equiped) but has evasion.

Greetings
Muktol

Not pauper legal

Personally I don't like "Blood Tribute".
Without acceleration it can't be played earlier than turn 6 (Thats if you start with 3 lands in your hand and draw 3 additional lands until turn 6) and until that you can allready have removed a great deal of your opponents lifepoints (especialy if Nocturnuc comes on turn 4). Lets say you have your opponent down to 10-12 lifepoints and you play "Blood Tribute": You spent cc6 on a spell that removes 5-6 lifepoints...even a "Shock" has a better mana/damage ratio. So I would sideboard this card and use it against e.g. lifegain.
I would also put "Elixir of Immortality" into your sideboard, as this is most usefull against mill, but to get life, there are better cards.

I would remove 4 creatures and add artifacts instead, to make sure you got enough equipment for your creatures, "Bone Saw" could be interesting for you.
You could also try to lower the number of lands to 19 or maybe even 18 as your mana-costs are rather low. Do some testgames to see where the ideal number for you lies.

To use "Rimescale Dragon" ability you need to get some snow-covered lands from the ice-age block. I would completly remove him as he is expensive to play and slow (enchantment decks normally are rather fast) and it would help you to get down to 60-62 cards.
I would sideboard "Spider Umbra" and change to e.g. "Forced Adaptation"
Furthermore you should add some more duallands to stabilize your mana-base.

Some suggestions, based on my G/W pauper enchantment deck (http://www.mtgvault.com/muktol/decks/gw-pauper-enchantment/)
Slippery Bogle ({G/U}; 1/1; hexproof)
Ethereal Armor ({W}; enchant creature; Enchanted creature gets +1/+1 for each enchantment you control and has first strike), Forced Adaption ({G}; enchant creature; at the beginning of your upkeep, put a +1/+1 counter on enchanted creature), Rancor ({G}; enchant creature; enchanted creature gets +2/+0 and gains trample. When Rancor is put into a graveyard from the battlefield, return Rancor to its owner's hand), Madcap Skills ({W}{R}, enchant creature; enchanted creature gets +3/+0 and can only be blocked by two or more creatures)

I hope I was able to help and give some ideas.
Greetings
Muktol

23 Lands seems 1-2 too many.
And if you work with "Ethereal Armor" I would try to add some more enchantments (possible not with the 'bestow' mechanic, as those cards are rather expensive to play as enchantment)

So, first you have to decide if you want to play either aggro, control or midgame.
Some control is good in almost every white deck, but if you use to many creatures like "Banisher Priest" you loose to many free slots for aggro creatures.
The second question is, if you want to built this like a competitive deck, which will remove many spells and replace them with 4 instances of other spells, or (as someone said that I helped recently) don't want to have a monotone deck.
Example for a competitive human deck could be my monoW human "http://www.mtgvault.com/muktol/decks/monow-tribal-human-wheeny/" and for a 'not so monotone deck "http://www.mtgvault.com/tomshwag/decks/manufactured-warfare/"

Pauper equipment deck (http://www.mtgvault.com/muktol/decks/monow-pauper-equipment-2/), costs ~25 €/$
Tough "Cranial Plating" is banned in pauper.

I would change from "Crusade" to "Honor of the Pure" as the only difference could be in a 2 headed giant duell when you play with someone who uses white. And "Crusade" is the only card which messes up the modern legality here (pointless if you only play with friends on the kitchen table ;) )
Theres one or two realy good equipments missing, so here are some suggestions, based on my monoW kor equipment deck (http://www.mtgvault.com/muktol/decks/monow-kor-equipment/)
Basilisk Collar ({1}; {2} to equip; Equipped creature has deathtouch and lifelink), Bone Saw ({0}; {1} to equip, Equipped creature gets +1/+0), Bonesplitter ({1}; {1} to equip; Equipped creature gets +2/+0), Cranial Plating ({2}; {1} to equip; Equipped creature gets +1/+0 for each artifact you control), Swiftfoot Boots ({2}; {1} to equip; Equipped creature has hexproof and haste), Infiltration Lens ({1}; {1} to equip; Whenever equipped creature becomes blocked by a creature, you may draw two cards).
Etched Champion ({3}; 2/2; Metalcraft -- Etched Champion has protection from all colors as long as you control three or more artifacts)
Darksteel Citadel (Artifact Land that produces {1})
I personally use "Kitesail Apprentice" and "Kor Duelist" as main attack-elements, but that differs from deck to deck.

I hope I was able to give you some ideas
Greetings
Muktol

*like* Very nice story, this could come directly from a Pen& Paper story! :)
Sadly i have to tell you that lifelink doesn't stack: Magic Rulebook, "705.15e Multiple instances of lifelink on the same object are redundant"
Some changes i would do:
Remove "Fiend of the Shadows" and "Sengir Vampire" and add "Vampire Nighthawk" instead.
Change from "Crippling Blight" to "Tragic slip" (Would also fit to your story 'he slipped and was never seen again' ;) )
Change from "Dark Favor" to "Edge of the Divinity" or "Skeletal Grimace"
Remove "Mark of the Vampire" as it is a little bit expensive for +2/+2 and lifelink
Reduce "Corrupt" by 1-2, as this is a finisher, and you don't need it on your start-hand

Some suggestions , based on my U/B pauper enchantment deck (http://www.mtgvault.com/muktol/decks/bw-pauper-enchantment/) and on my U/B pauper vampire sacrifice deck (http://www.mtgvault.com/muktol/decks/bw-tribal-vampire-sacrifice/)
Necromancer's Magemark ({2}{B}; enchant creature, creatures you control that are enchanted get +1/+1. If a creature you control that's enchanted would be put into a graveyard, return it to its owner's hand instead), Ethereal Armor ({W}; Enchant creature Enchanted creature gets +1/+1 for each enchantment you control and has first strike), Hyena Umbra (Totem Armor; enchant creature, Enchanted creature gets +1/+1 and has first strike), Immortal Servitude ({X}{B/W}{B/W}{B/W}; Return each creature card with converted mana cost X from your graveyard to the battlefield.)

I hope I was able to give you some ideas
Greetings
Muktol

I had "Puresteel Paladin" in this halfdeck but the equip costs are very low on this deck I removed him to get some free slots.
"Auriok Steelshaper" is a good idea, I will trade it for one "Etched Champion"

"Lost Leonin" is a nice card, but I favour "Kor Duelist" (praticaly a 4/1 or a 2/1 deathtouch) or "Kitesail Apprentice" (evasion). "Grafted Exoskeleton" is a little bit too expensive to fit in here (cc4)
"Skyhunter Cub" is pretty much the same as "Kitesail Apprentice"

"Crusade" and "Ancient Den" (The artifact land you meant) are not modern legal. As for "Crusade" this would fit into an enchntment deck, but here the creatures benefit from equipment and atifacts.

Looking good *like*
I would sideboard "Glaring Spotlight" and increase the number of "Kruin Outlaw" and "Wolfbitten Captive" by one. An option to "Wolfbitten Captive" could be "Young Wolf", as he also benefits from the werewolf and wolf buffs, but is a little harder to get rid of with undying.
Perhaps add some more duallands to stable your manabse (See "http://www.mtgvault.com/muktol/decks/gr-tribal-werewolfs-2/" for some)

Greetings
Muktol

Infect decks are normally pretty fast (http://www.mtgvault.com/muktol/decks/monog-infect/ can finish my opponent (with a god-hand) within turn 2), so do some testgames and see if you NEED the Hydra :)