villain vs wild card

villain

noun
  • Any opponent player, especially a hypothetical player for example and didactic purposes. Compare: hero (“the current player”). 

  • A vile, wicked person. 

  • An extremely depraved person, or one capable or guilty of great crimes. 

  • In fiction, a character who has the role of being bad, especially antagonizing the hero. 

  • A deliberate scoundrel. 

wild card

noun
  • A competitor or team that is allowed to compete in a tournament despite not reaching the normal standards to qualify for inclusion. 

  • A card that can be assigned any value or used to substitute for any needed card. 

How often have the words villain and wild card occurred in a corpus of books? (source: Google Ngram Viewer )