I would keep that hand. You say it is slow, but i disagree. This hand ramps like crazy. Like you mentioned you can Savannah -> GSZ -> Dryad Arbor. T2 you could GSZ for 2 and get Scooze or Gaddock Teeg. Or just get a mana dork and hold the Savannah for Plow and T3 GSZ into Knight. Pretty solid.