Dark Eldar Voidraven. Load up with Monscythe (S6 AP5 Large Blast) missiles, find a target bubble wrapping their tanks with infantry against my Haywire Grenades, and fire all the missiles at the tank along with the two lances. The missiles are placed at the tank edge so as to maximize the number of infantry models they hit. In addition to causing numerous infantry casualties, I often kill the tank. I've killed tanks and wiped out whole infantry units simultaneously with this tactic. Pretty soon, my opponents are leaving their tanks exposed for my Haywire, sometimes allowing me to surround and kill everyone inside their transports by blocking the exits.