<b_jonas> `` echo $\'#!/bin/sh\\nexec perl -e\\\'\'\'open$I,"<","share/mtg/allsets.txt"or die$!;$/=""; @c=grep{/(?i:$ARGV[0])/}<$I>; print $c[rand($c)];\'\\\'\' "$1"\' > bin/random-card && chmod -v a+x bin/random-card

We don't know what certainty is for sure, but at least it isn't a functor.