Yeah Hydra Sorc are very funny PvP Char
I got 1 and very simple to do
Shako
ViperMagi or Shaft
TGot
Luna or Lidless or Whistan's Guard or Ss
Raven
Soj
MageFist
Aldur Boot...
Occy

Pump Dex to get Max Block
Pump Vita
100 point into mana
Classic Sorc build.. but that's all u need

MaX MF/Hydra and/or TS/LM and/or Orb/Blizzard/CM
some points into Static
FireBall is fun too

Get 3-4 rows of 5%rw fill out the rest with life/prysmatic charm or fire skill.. dont teleport just walk with your hydra make some strategy very funny PvP char... Play agressive