picture card vs plain card

picture card

noun
  • A playing card which has a picture on it (usually Jack, Queen or King (coat card), but sometimes including Ace or Joker). 

  • A trading card/trade card. 

  • A flash memory card for a digital camera. 

plain card

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