b997eee8_CCG___What_s_That_Inside_Joke___In_joke
[Card] Nxi - Nesting Warrior [Exp.] RD4 [Type] EE [In-joke] 
Aside from the triangles which are Nxi's signature, the symbols are designed letters spelling the words "Ice Warrior".
Unauthorized Dr. Who CCG - What's That Inside Joke?
In-joke