(info from youtuber hirumaredx and wowhead)
Disguise yourself as a Doomsayer.
Go to enemy factions city and kill a particular NPC
For Horde players go to Stormwind and kill Gordon MacKellar located in a building in the Mage Quarter – see map
It’s not a 100% drop – you may have to kill a few times – 5-6 minute respawn rate
He is only lootable if he has the toy
There will be one other Npc and a couple guards but easy
For Alliance players go to Orgrimmer and kill Charles Gastly located up at the Horde zeppelins – he’s by the one to the Undercity