Muktol

I would remove "Duty-Bound Dead" and "Knight of Infamy" for "Bloodghast"
Furthermore I would change from 4 "Guul Draz Vampire" or "Vampire Lacerator" to 3 "Guul Draz Assasine" and an additional "Feast of Blood"

Greetings
Muktol

http://www.mtgvault.com/muktol/decks/monow-tribal-human-wheeny/
One of my first decks, and a deck that I steered through some local tournaments. Perhaps you can take some ideas from there ;)

Some suggesgtions, based on my monoR goblin deck (http://www.mtgvault.com/muktol/decks/monor-tribal-goblins/)
Infiltration Lens (Carddraw)
Bloodmark Mentor (First strike for your red creatures), Goblin Chieftain (+1/+1 and haste for all other goblins), Goblin King (+1/+1 and mountainwalk for all other goblins), Goblin Wardriver (Battlecry), Krenko, Mob Boss, Legion Loyalist (Battailion: trample and first strike for all attacking creatures), Mogg War Marshal (when he comes and leaves, put a 1/1 token into play), Siege-Gang Commander, Spikeshot Elder,
Quest for the Goblin Lord (Buff), Aether Vial (faster and cheaper play), Simian Spirit Guide (Red ramp), Blood Moon (All nonbasic lands are mountains)

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

That could solve the problem, enought assumed you have mana ;)
Try "Grimclaw Bats" instead of/ additional to "Wall of Blood"

Your opponent doesn't even have to destroy the wall, a cc1 "Shock" on the stack will do the trick, to kill you, also.
Stack: Wall of Blood -> pay 19 life -> Essence Harvest -> Shock, you get 2 damage, have allready paied 19 life to activate Wall of Blood and thus get to -1 life bevor Essence Harvest resolves.
Furthermode Wall of Blood is no ideal creature, as it is a defender and thus cannot attack. Search for a 2/2 creature with the same effect, preferably with some sort of evasion, and you could take out a second opponent.

For a beatdown-deck I would remove the extort part, and lower your mana-curve.

If you want to stay within Vintage/ Legacy legality I would reccomend on using more cards from this legality.
If you want to stay modern legality, you will have to remove "Gempalm Incinerator" and "Skirk Fire Marshal"

I would do some changes here:
Change from "Boldwyr Intimidator" to "Furystoke Giant" as it costs less and is more efficient the more creatures you have.
Change from "Artillerize" to "Goblin Grenade". Does the same, but costs {2} less to play.
An alternative to "Dynacharge" could be "Quest for the Goblin Lord" (see suggestions)
Remove "Shock" and increase the Number of "Goblin Grenade" / ("Artillerize"), "Quest for the Goblin Lord" / ("Dynacharge" and Lightning Bolt.
Remove "Assault Strobe" as you mostly have 1/1 creatures and double strike on a single, small, creature istn't that good.
23 Lands seem awfully much, so I would try to reduce it to 20.

What I am missing in your deck are some 'work'-goblins, those who do de dirty job. Many 1/1 without anything are not bad, but you will need support for them.
When using black creatures I strongly recommend to use some duallands. You can play the mainboard and thus have more free space in your sideboard, and they leave you the option to play a red or black spell.

Some suggestions, based on my monoR Goblin deck (http://www.mtgvault.com/muktol/decks/monor-tribal-goblins/) and my (untested) B/R pauper goblin deck (http://www.mtgvault.com/muktol/decks/br-pauper-goblins-2/)
Infiltration Lens ({1}; {1} to equip; draw to cards when equipped creature gets blocked)
Bloodmark Mentor ({1}{R}; 1/1; your red creatures have first strike), Furystoke Giant ({3}{R}{R}; 3/3; persists; when he enters the game, alls your creatures get: tap: this creature deasl 2 damage to target opponent (or creature), Goblin Chieftain ({1}{R}{R}; 2/2; all your goblins get +1/+1 and haste), Goblin Wardriver ({1}{R}; 1/1; battlecry), Legion Loyalist ({R}; 1/1; battailion: attack with him and 3 creatures: creatures you control get trample and first strike), Mogg War Marshal ({1}{R}; 1/1; when he enters or leaves the battlefield, you get an 1/1 goblin token), Goblin Bushwhacker ({R}; kicker {R}; 1/1; when it enters the battlefield and was kicked, creatures you control get +1/+0)
Quest for the Goblin Lord ({R}; whenever a Goblin enters the battlefield under your control, you may put a quest counter on Quest for the Goblin Lord. As long as Quest for the Goblin Lord has five or more quest counters on it, creatures you control get +2/+0), Goblin Grenade ({R}, sacrifice a goblin; goblin Grenade deals 5 damage to target creature or player)

I hope I was able to help and to give you some ideas
Greetings
Muktol
(Sorry for my bad english as I am no native speaker)

Most decks utilize "Lightning Bolt" as removal.
Here "Spikeshot Elder" or "Goblin Grenade" do the job, and I wouldn't know what to take out for 3-4 Bolts.

I would sideboard "Grand Abolisher", "Icatian Javelineers" and perhaps "Soldier of the Pantheon"
Grand Abolisher is usefull against control, but without that, he's a 2/2 without anything.
The same is true for "Icatian Javelineers" after he has shot taht 1 point of damage. Nice to remove a creature, but I would use a Pazifism or Oblivion Ring instead.
"Soldier of the Pantheon" can be usefull (forget about the lifegain) against multocolored, but not erevy deck you encounter will have many multocolor spells in it.

Some suggestions, based on my monoW human wheeny deck (http://www.mtgvault.com/muktol/decks/monow-tribal-human-wheeny/)
Hero of Bladehold ({2}{W}{W}; 3/4; Battle cry; whenever he attacks, put two 1/1 white Soldier creature tokens onto the battlefield tapped and attacking), Kazandu Blademaster ({W}{W}; 1/1; First strike; vigilance; whenever Kazandu Blademaster or another Ally enters the battlefield under your control, you may put a +1/+1 counter on Kazandu Blademaster), Mentor of the Meek ({2}{W}, 2/2; whenever another creature with power 2 or less enters the battlefield under your control, you may pay {1}. If you do, draw a card ("Honor of the Pure" has a little anti-synergy with this card)), Silverblade Paladin ({1}{W}{W}; 2/2; as long as Silverblade Paladin is soulbound with another creature, both creatures have double strike), Sublime Archangel ({2}{W}{W}; 4/3; flying, exalted, other creatures you control have exalted), Thraben Doomsayer ({1}{W}{W}; 2/2; Tap: Put a 1/1 white Human creature token onto the battlefield. Fateful hour -- As long as you have 5 or less life, other creatures you control get +2/+2)
Bonds of Faith ({1}{W}; Enchanted creature gets +2/+2 as long as it's a Human. Otherwise, it can't attack or block), Call to Serve ({1}{W}; Enchanted creature gets +1/+2, has flying), Battlewise Valor ({1}{W}; target creature gets +2/+2 until end of turn. Scry 1)
Emeria, the Sky Ruin (Land against removal)

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

Pulse Tracker is a good start, but you have (?had?) Vampire Lacerator in, and he is more potent, tough he has the drawback of loosing 1 life per turn.
Guul Draz Vampire is a 1/1 for {B} with nothing on the start, so just bad. And if you have your opponent down to 10 life, you normally have a bunch of creatures out on the battlefield that got him there, and is willing to finish the job. So the card is just overkill and blocks slots for other, more usefull creatures.

Some changes I would do:
Remove "Markov Blademaster" as he is to slow or needs massive support (removal, enchantments, equipment) to get to your opponent.
Lower the number of "Bloodline Keeper" to 3, as he costs rather much (cc4)
Raise the number of "Vampire Nighthawk" to 4
Lower the number of "Dreadbore" to 2 and raise "Terminate" to 4. You shouldn't encounter that many planeswalkes, and if, use 2 more "Dreadbore" in your sideboard.
A alternative to "Gruesome Deformity" could be "Shadow Alley Denizen" as you play enough black creatures. If played, use it 3-4 times.

Some suggestions, based on my B/R vampire deck (http://www.mtgvault.com/muktol/decks/br-tribal-vampire/)
Stromkirk Noble ({R}; 1/1; can't be blocked by humans; when he deasl player damage, he gets a +1/+1 counter), Curse of Stalked Prey ({1}{R}; enchantment/ curse; whenever a creature deals combat damage to enchanted player, it gets a +1/+1 counter), Go for the Throat ({1}{B}, destroy target non-artifact creature), Sign in Blood ({B}{B}, pay 2 life: draw 2 cards), Read the Bones ({2}{B}, pay 2 life; scry 2 then draw 2 cards)
Blackcleave Cliffs (dualland), Dragonskull Summit (dualland), Graven Cairns (dualland)

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

You don't have anything to use the masses of mana pdoruced with "Caged Sun". To get the +1/+1 effect there are cheaper ways, like "Bad Moon" or another "Captivating Vampire"
Furthermore I would remove "Mindcrank" as it's harder to mill 60 cards (60 (or 30 with two of them) damage in your case) than to beat your opponent to zero life (20+ damage)
I would change from "Underworld Connections" to "Read the Bones" as it gives you the chance to dig up to 4 cards deep into your library. Yes it's not reusable, but it might give you what you need, now.
"Bojuka Bog" belongs into a sideboard, against graveyard-decks. You could add some searchlands like "Evolving Wilds" or "Marsh Flats"

Some suggestions. based on my B/R vampire deck (http://www.mtgvault.com/muktol/decks/br-tribal-vampire/)
Bloodghast ({B}{B}; 2/1; can't block; comes again from the graveyard with landfall), Guul Draz Assassin ({B}; 1/1; level up {1}{B}, level 2-3: pay {B}, tap, target creature gets -2/-2)
Sign in Blood ({B}{B}, pay 2 life; draw 2 cards), Read the Bones ({2}{B}, pay 2 life; scry 2 then draw 2 cards), Blade of the Bloodchief ({1}, {1} to equip, equipped vampire gets 2 +1/+1 counters if a creature died)

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

Looking better now.

I would additionaly do the following changes:
+2 Bloodghast
-2 Guul Draz Vampire
-4 Pulse Tracker
+2 Vampire Lacerator
+2 Vampire Nighthawk

If enough creatures (your or your opponents) go into the graveyard, you could thing of "Tragic Slip" as replacement for "Grasp of Darkness", which also would lower your mana-curve a little bit.

Deceide either for "Bloodlord of Vaasgoth", "Kalitas, Bloodchief of Ghet" or "Nirkana Revenant", and remove the others.
Then I would do some testgames and see which creatures work, and which don't. Try to increase the quantity of the rest, to draw cards you want to have more constant.

Neither is suited for pauper.

The Problem I see is, that you will have to protect yourself.
Elfs are all fine, but I think you would do better using defenders here.

Why the hell do all black decks use "Dark Ritual" at the moment...(Not meant to offend you, I simply don't understand it)

Some things I would change here:
Remove "Pulse Tracker". There are better cc1 vampires (in red)
Remove "Doom Blade". There are better removals
Remove "Chandra Nalaar". Belongs into a burn deck, and even there she is way to expensive for what she can do.
Remove "Blood Tribute". To expensive, when you are able to play it, wou should allready have reduced your opponent's lifepoints to a great deal.
Remove "Rakdos Guildgate". Comes into play tapped and thus slows you down.

Sideboard "Blood Seeker". He is very good against e.g. token decks, but against a deck which play only a few, strong, creatures, he is less usefull.

Questionable
"Gatekeeper of Malakir". The tripple black costs are hard in a B/R deck

Add:
+1-2 Rakish Heir
+1 Stromkirk Captain
+1-2 Vampire Nocturnus
+1 Geth's Verdict
+2 Read the Bones

Some suggestions, based on my B/R Vampire deck (http://www.mtgvault.com/muktol/decks/br-tribal-vampire/)
Bloodghast ({B}{B}; 2/1; can't block; comes again from grave with landfall), Stromkirk Noble ({R}; 1/1; gets a +1/+1 counter every time he hits your opponent)
Curse of Stalked Prey {1}{R}, alternative to "Rakish Heir"), Lightning Bolt ({R}, deals 3 damage to player or creature), Terminate ({B}{R}, destroy target creature, it cant be regenerated)
Blackcleave Cliffs (dualland), Dragonskull Summit (dualland), Graven Cairns (dualland)

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

Some suggestions, based on my monoR goblin deck (http://www.mtgvault.com/muktol/decks/monor-tribal-goblins/) and my monoW equipment deck (http://www.mtgvault.com/muktol/decks/monow-kor-equipment/)
Remove 2-3 "Panic Spellbomb" for additional "Infiltration Lens"
Remove "Accorder's Shield" for e.g. "Bone Saw" as it would be more aggresive
Change from "Darksteel Axe" to "Bonesplitter" as it is cheaper to play
Change from "Memnite" to "Cranial Plating"
Lower the (total) number of lands to 20, or even maybe 18 (test it out) and add 1-3 "Teetering Peaks" instead of normal mountains.
I would give e.g. "Dragon Fodder" a test as you only have 1 goblin to buff your creatures and thus one token more or less doesn't really make a difference. Yes, it's more expensive to play, but you don't loose the euipment you want to buff your creatures with.

With so many equipment you could also take a look at "Goblin Gaveleer" and/ or "Warren Instigator"
A good way to speed up your game could be "Æther Vial"

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

I would use some less 1-offs and try to increase the number of some other cards instead.