b997eee8_CCG___What_s_That_Inside_Joke___In_joke
[Card] The Doctor (3) - Barflying Under the Radar [Exp.] RD1 [Type] Pun Ref Ref [In-joke] 
Obviously, the subtitle is a pun: Barfly / Flying under the radar The Poison Trait is there because she poisoned herself every night with alcohol. The bar where she has been composited is from the Hitchhiker's Guide to the Galaxy tv series, which was famously written by Douglas Adams who served as Doctor Who's script editor for a year. Since this Unbound installment was comedy, the visual reference is even more fitting.
Unauthorized Dr. Who CCG - What's That Inside Joke?
In-joke