Starfall Dragon
The Starfall Dragon is an EXCLUSIVE pet that was available from the Exclusive Pets Egg, introduced in the Easter Update 2022. It had a 13% chance of hatching.
The latest Pet Simulator X value list for Starfall Dragon can be found below:

Regular
💎 29,000,000,000 (29b)

Golden
💎 Not Available

Rainbow
💎 Not Available

Dark Matter
💎 Not Available