Just a note: This deck is a low-budget deck, and I'm not planning on using it in tournaments.

4 Ravenous Rats
4 Abyssal Specter
4 Deathgazer
4 Maggot Carrier
4 Severed Legion

4 Dark Banishing
4 Megrim
3 Befoul
2 Larceny
2 Coercion
2 Disrupting Sceptor
1 Waking Nightmare

22 Swamp

Sideboard:

4 Dusk Imp
3 Nezumi Cutthroat
2 Cursed Ronin
2 Midnight Covenant
2 Sever Soul
1 Drudge Skeletons
1 Distress

there are many cards that could help you out
hymn to tourach ***
duress ***
blackmail
mind twist
dark ritual ***
The Rack
Ostracize
Persecute
Order of Yawgmoth
hypnotic specter ***
hollow specter
abyssal specter

actually if you check out the official wizards site this week, they have a bunch of articles on Discard

yea, listen to that last post, he knows what he's talking about, and maybe even spellweaver helix