Treasure Goblin
Source: Promotion. Watch your coin purse. Humanoid type.
The Treasure Goblin is a promotional battle pet obtained by purchasing the Diablo 3: Reaper of Souls Digital Deluxe or Collector's Edition, after which it arrives directly in your in-game mailbox.
Guide awaiting review
Purchase Reaper of Souls Deluxe
Purchase the Diablo 3: Reaper of Souls Digital Deluxe Edition ($59.99) or Collector's Edition from the Battle.Net Shop. The Treasure Goblin battle pet is included as a bonus with these editions and will be delivered to your in-game mailbox.
Claim From In-Game Mail
Log into World of Warcraft and open your mailbox to collect the 
Treasure Goblin. The delivery message references the writings of Abd Al-Hazir, warning of devious goblins who rob merchants and vanish through portals into Greed's domain.
Tips
When summoned, the Treasure Goblin jingles with gold sounds and periodically tosses handfuls of coins — the small coins display a Murky symbol with a tophat.
The Treasure Goblin's abilities include Coin Toss, Wild Magic, Dodge, Magic Sword, Sear Magic, and Portal.
