b997eee8_CCG___What_s_That_Inside_Joke___In_joke
[Card] K9 Mark II - Old Sea-Dog [Exp.] AW [Type] Ref [In-joke] 
The special ability to Vortex Moves is based on his playing chess in "The Androids of Tara" and elsewhere.
Unauthorized Dr. Who CCG - What's That Inside Joke?
In-joke