Grixis Delver

The backbone of the deck are Cabal therapy and young pyromancer imo, I dont think you really want to play that many lands or 3 drops in the deck.
The list I was working on looked like this:

Lands(18)
4 Polluted Delta
4 Scalding Tarn
2 Steam Vents
2 Watery Grave
2 Island
1 Mountain
1 Swamp
1 Darkslick Shores
1 Sulfur Falls

Creatures(12)
4 Delver of Secrets
4 Young Pyromancer
2 Snapcaster Mage
2 Dark Confidant

Instants & Sorceries (30)
4 Lightning Bolt
1 Terminate
4 Counterspell
3 Spell Snare
2 Stifle
4 Cabal Therapy
4 Gitaxian Probe
4 Sleight of Hand
4 Serum Visions

Sideboard (15)
4 Surgical Extraction
2 Duress
2 Dispel
1 Negate
2 Electrickery
2 Terminate
1 Kolaghan's Command
1 Vandalblast