marvel vs past master

marvel

noun
  • That which causes wonder; a prodigy; a miracle. 

verb
  • To become filled with wonderment or admiration; to be amazed at something. 

past master

noun
  • One who has an extremely high level of ability or knowledge within an area of achievement or expertise. 

  • Someone who has previously been a master at a given lodge. 

How often have the words marvel and past master occurred in a corpus of books? (source: Google Ngram Viewer )