Ok this deck is still in the test phases so there are a lot of things that can be changed, please dont hold back your advice, give me a link and i'll return the favour.

---------------------------------------
The March of the Doomed (17):
---------------------------------------
Tyrants (2):
---------------
Dark Necrofear x2

The Fodder (5):
--------------------
Kuriboh x2
Slate Warrior x3

The Special Agents (6):
-----------------------------
Dark Jeroid
Newdoria x2
Night Assailant x3

Mercenaries (4):
--------------------
Tribe Infecting Virus
Sinister Serpent
Magical Scientist
Breaker the Magcial Warrior

--------------------------------------
Ha-Des' Magcial Legions (17):
--------------------------------------

The Rains of Hell (6):
--------------------------
Tribute to the Doomed x2
Dark Core x2
Back to Sqaure One x2

Divide and Conquer (4):
------------------------------
Snatch Steal
Change of Heart
Creature Swap x2

Magical fodder (2):
------------------------
Scapegoats x2

Return of the Doomed (3):
---------------------------------
Premature Burial
Monster Reincarnation x2

Minesweepers (2):
------------------------
Heavy Storm
Mystical Space Typhoon

---------------------------
Devious Suprises (6):
---------------------------

Mines (4):
------------
Divine Wrath
Raigeki Break x2
Torrential Tribute

Suprise Return (1):
------------------------
Call of the Haunted

Protector of the Servants (1):
-------------------------------------
Magic Jammer



The general idea is to use the N.As and Sinister in combination with all the discard effect cards to gain control of the field, while using the fodder as... fodder and to help in bringing out the Necrofears. The Slate Warriors also double up as the hard hitters should the going get though.
Anyways please r/f, remember i WILL return the favour.

HEY!!!! Add 2 Mystic Tomatos to the deck then test it. I really dont think it will help much but it comes in handy with the Creature Swaps. Also drop the number of cards that can only be activated it you discard a card from your hand. Majority of fiend decks burn though cards quickly.

Rating: 8/10

PS: Add a Dark Ruler Ha Des