b997eee8_CCG___What_s_That_Inside_Joke___In_joke
[Card] The Master (13) - Serious Threat to Peace [Exp.] TL [Type] Pun [In-joke] 
Called a Serious Threat because he posed as the Commissioner of Sirius 4. Ouch.
Unauthorized Dr. Who CCG - What's That Inside Joke?
In-joke