Muktol

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 :)

You have to decide how you want to win. If your strategy is to win by lifegain, I would add some more creatures from a soul sisters deck, if you want to win by beatdown with angels, add green to ramp and to get your important angels faster. Using both strategies won't help the other one.

Greetings
Muktol

I would cut some creatures (e.g. "Llanowar Elves" as you don't need ramp) to add some more spells that allow you combat tricks (e.g. Mutagenic Growth). Also control elements like discard won't fit into an aggressive deck-type like infect.
With 24 Lands you will be on the high side, so you could try to reduce it to 22 or even 20

Greetings
Muktol

Looking good *like*
I would put "Daybreak Ranger" into the sideboard and increase the number of "Reckless Waif", "Full Moon's Rise" and "Wolfbitten Captive"
In my own deck (http://www.mtgvault.com/muktol/decks/gr-tribal-werewolfs-2/) I play "Young Wolf" over "Wolfbitten Captive" as he also benefits from the wolf-buffs and has a high chance of surviving due to undying. And you don't have to pay mana every time to buff him up.

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

I would cut 1-2 "Captivating Vampire" to add a "Vampire Nighthawk" and/ or a "Bloodghast". Normaly you will rarel be able to use the second abbility from the "Captivating Vampire" and even if, you won't have enough vampires on the field to activate it twice.
I would also cut 1 "Bloodline Keeper" as he has the same converted manacosts as "Vampire Nocturnus" and if you have both on the hand, wou always want to play Nocturnus.
"Guul Draz Vampire" is a onedrop that you should replace. People always ask me why: He is a 1/1 for cc1 and does nothing more. When your opponent is a 10 life, you should be able to win without him anyway, as you allready have dealt massive (at least 50%) damage to your opponent. Perhaps change from "Guul Draz Vampire" to "Vampire Lacerator" as this is a rather aggresive card that yould fit into this deck
"Sorin's Vengeance" as one-off is rathe runnecessary. cc7 to deal 10 damage is no good ratio, and you should have defeated your opponent earlier and faster with your creatures. I would add a second "Bloodlord of Vaasgoth" or some removal spells instead of it.
What I'm missing here is some more removal to enable your creatures to deal damage to your opponent.

I hope I was able to help you a little bit.
Greetings
Muktol

I use defenders-ramp in my http://www.mtgvault.com/muktol/decks/wg-tribal-angel/ deck and with some luck I'm able to play any angel I want to within turn 4. Maybe you can take some ideas from there :)

Greetings
Muktol

<- German and English, and since English is the main language here, i do most of my writing in English ;)
All of the cards. You want to get some continuity in your deck, so you want to have your key-cards as often as you can get them (which is 4x) to draw the as often and as regular as possible. Many cards are hinder you from getting what you want.
This are two of my goblin decks, which might also help you:
http://www.mtgvault.com/muktol/decks/monor-tribal-goblins/
http://www.mtgvault.com/muktol/decks/br-pauper-goblins-2/

Greetings
Muktol

"Auriok Sunchaser" benefits from metallcraft and thus some (free to play) additional artifacts are a must have.

*like*
I would perhaps remove "Kor Outfitter" ({W}{W}) as "Accorder's Shield" ({3} to equip) would be the only equipment to benefit from the 'free' equip. All other equipment you have costs equal or less to equip.
And with the low costs you could try to reduce the number of lands to 20 and add some more equipment to your deck.

Greetings
Muktol

continuity when playing it.

Greetings
Muktol