Speede

Please review and comment.
I just started playing Magic at the beginning of July (2008)

Any help would be appreciated. Including combos this deck has or other cards that may be better suited for this style of deck.

The Main focus is to have Creatures with Wither or Spells that deal -1/-1 counters (Scar, Puncture Bolt) and have a control element using Blowfly Infestation / Chainbreaker and Kulrath Knight

Thanks