I've been leecher for so long time and I thought to share something for the community. Sorry for my bad english, I'm german. :P
When you do the quest On Ruby wings On Ruby Wings - Quest - World of Warcraft you get a drake with many LP to killing questmobs, but this drake can auto-attack player from the other faction (when PvP is activated).
It's really fun because the drake do 900-1000 dmg per hit and when the player from the other faction attack, the guards will attack him.
Screenshots:
hope you like it