I've been using a deck that's loosely based on TMWA that runs black. The card choices are pretty straight forward. I've been meeting with mild success but the deck is still in its developmental stages. Here's the current deck list I've been running:   

 creatures: 13
x4 dark confidant
x3 kitaki, war's wage
x3 goblin vandal
x3 gorilla shaman

other spells: 24
x4 magma jet
x3 duress
x3 swords to plowshares
x3 planar void 
x2 hide/seek
x2 seal of cleansing
x1 vampiric tutor
x1 enlightened tutor
x1 rack and ruin
x1 hymn to tourach
x1 demonic tutor 
x1 imperial seal

artifacts:7
x1 lotus petal 
x1 mox jet
x1 mox pearl
x1 mox ruby
x1 black lotus
x2 null rod

lands: 17
x4 bloodstained mire
x3 wasteland
x2 scrubland
x2 plateau
x2 badlands
x1 stripmine
x1 mountain
x1 swamp
x1 plain

side board: 15
x2 pithing needle
x3 sacred ground
x3 pryroclastic pillar
x3 diabolic edict
x4 lightning bolt

Battle Ground Games
1501 Bedford St (Rt 18)
Abington, MA 02351
Phone: 1-781-261-9669
http://www.battlegroundgames.com/

I notice that not to many fish decks run pithing needle. I run 3 in my current build and find them pretty darn amazing. What are people's thoughts as to why they aren't used as a standard in fish builds with the current meta?