Crystal Deer
The Crystal Deer is an EXCLUSIVE pet that can be redeemed from the Season 1 Toys DLC Codes. There is a 23% probability of getting it from an Epic Tier DLC Code, and a 15% probability of getting it from a Rare Tier DLC Code. It is similar to the Deer pet. It was released in an update on June 24th, 2022.
The latest Pet Simulator X value list for Crystal Deer can be found below:

Regular
💎 62,500,000,000 (62.5b)

Golden
💎 Coming Soon!

Rainbow
💎 Coming Soon!

Dark Matter
💎 Not Available