No longer available to players. It dropped from Jan'alai in Zul'Aman prior to the raid instance's conversion to a 5-man heroic dungeon in Patch 4.1. The closest you can get to this model is Voodoo Hexblade but the color scheme is much darker. :(
Wubwub was a shaman on Mal'Ganis who belonged to the Elitist Jerks guild before his retirement.