John Backus, an Uncommon card

The card carries these facts from its Wikipedia article.

• He led the team that invented and implemented FORTRAN, the first widely used high-level programming language, and was the inventor of the Backus–Naur form, a widely used notation to define syntaxes of formal languages.
• He also contributed to the design of ALGOL, and later researched the function-level programming paradigm, presenting his findings in his influential 1977 Turing Award lecture "Can Programming Be Liberated from the von Neumann Style?" The IEEE awarded Backus the W. W. McDowell Award in 1967 for the development of FORTRAN.
• He received the National Medal of Science in 1975 and the 1977 ACM Turing Award "for profound, influential, and lasting contributions to the design of practical high-level programming systems, notably through his work on FORTRAN, and for publication of formal procedures for the specification of programming languages".

Rarity in WikiCards follows a year of Wikipedia page views: the most read articles become Epic and Legendary cards. The John Backus article was read about 33,000 times in a year. ATK comes from the length of the article and DEF from its quality, so this card hits with 63 and blocks with 34: each hit it takes is cut by 14 %.

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The cards just above and just below John Backus in the power ranking, all domains together.