Silver Stag
The Silver Stag is a MYTHICAL pet that was available from the Christmas Tree Egg and Egg of Many Gifts for a short period of time. It could be hatched during the Christmas Event 2021.
The latest Pet Simulator X value list for Silver Stag can be found below:

Regular
💎 1,200,000 (1.2m)

Golden
💎 3,500,000 (3.5m)

Rainbow
💎 10,600,000 (10.6m)

Dark Matter
💎 33,000,000 (33m)