b997eee8_CCG___What_s_That_Inside_Joke___In_joke
[Card] Omega (13) - Impure Thought [Exp.] RD2 [Type] Pun [In-joke] 
The subtitle refers to Omega being reputed to be a being of pure thought in "Omega", but he isn't quite that...
Unauthorized Dr. Who CCG - What's That Inside Joke?
In-joke