b997eee8_CCG___What_s_That_Inside_Joke___In_joke
[Card] Yesterday's Enterprise [Exp.] 9D [Type] Ref [In-joke] 
The title is the same as that of a famous Star Trek episode. Though you may think the designer is showing his roots again by making this reference/pun, this was totally the idea of contributor Colin "Doc Filth" Hicks. So there.
Unauthorized Dr. Who CCG - What's That Inside Joke?
In-joke