Help me build a deck! (Mono Black)

Hey guys, i got some cards and i was just wondering what could be the best deck i could make with them.
here are the cards that i have to build my deck

Creatures:
4 x Fume Spitter :manab:
3 x Odious Trow
1 x Blood Pet
1 x Plagued Rusalka
1 x Thoughtpicker Witch
4 x Fog of Gnats :mana1::manab:
4 x Dregscape Zombie
4 x Blightsoil Druid
2 x Wicked Akuba
2 x Stalker Hag :mana2::manab:
4 x Severed Legion
2 x Phylactery Lich
1 x Toshiro Umezawa
2 x Quagmire Druid
3 x Skinrender :mana3::manab:
2 x Sangromancer
3 x Crowd of Cinders
1 x Filth
1 x Dimir House Guard
1 x Sengir Vampire
1 x Nightmare

Spells, enchantments, sorcery and artifacts:
1 x Unearth :manab:
1 x Dark Ritual
1 x Ostracize
1 x Lurking Jackals
2 x Soul Reap :mana1::manab:
4 x Grasp of Darkness
4 x Geth's Verdict
2 x Yoke of the Dammed
4 x Terror
4 x Seal of Doom :mana2::manab:
4 x Dark Banishing
4 x Rend Flesh
2 x Corrupt :mana5::manab:
4 x Needlebite trap :mana5::manab::manab: / :manab:
3 x Infiltration Lens :mana1:
1 x Demon's Horns :mana2:

Lands:
18 x Swamp
2 x Vault of Whrispers

Some decks i've already made with this cards:
http://www.mtgvault.com/ViewDeck.aspx?DeckID=206988
http://www.mtgvault.com/ViewDeck.aspx?DeckID=207336

Thanks,,
Rak