Celestial Calf
Sold by The Mad Merchant. How the Mad Merchant got his hands on one of these otherworldly creatures is unknown. What we do know is, he knows it's valuable. Magic type. Sold by (the Mad Merchant - Link isn't updated yet) for 1,000,000g* *Subject to change Other items for sale 34 Slot bag 500,000g Toy 250,000g Battle Pet 1,000,000g Mount 2,000,000g
The 
Celestial Calf is a battle pet sold by The Mad Merchant in Dalaran during the Legion expansion.
Guide awaiting review
Locate The Mad Merchant
Head to The Wonderworks Toy Shop in Dalaran and look for The Mad Merchant. He spawns on a very random timer, anywhere from 4 hours to several days, and will despawn roughly 1-2 hours after someone makes a purchase from him. It is courteous to announce in trade chat when he spawns so other players can take advantage of his presence.
Purchase The Celestial Calf
Buy the Celestial Calf from The Mad Merchant for 
1,000,000 Gold. He also sells 
Madman's Luggage for 500,000 Gold, 
Prismatic Bauble for 250,000 Gold, and 
Bloodfang Cocoon for 2,000,000 Gold.
Tips
Once summoned, the Celestial Calf periodically triggers a starfall effect around you and displays a small crescent moon above your character's head.
