b997eee8_CCG___What_s_That_Inside_Joke___In_joke
[Card] Birostris Prime (4007) [Exp.] 10D [Type] Ref [In-joke] 
The planet is named after the scientific nomenclature for the manta ray Manta birostris seeing as manta rays are flying in the sky. Thanks to pal Radagast for naming it.
Unauthorized Dr. Who CCG - What's That Inside Joke?
In-joke