Simple LaTeX code for drawing playing-card like rectangles with numbers

tikzcards.sty

\NeedsTeXFormat{LaTeX2e}[1994/06/01]
\ProvidesPackage{tikzcards}

% Copyright 2019 Magnus Lie Hetland

\RequirePackage{tikz}
\usetikzlibrary{math}

\RequirePackage{options}
\RequirePackage{etoolbox}

\options{
    /tikzcards/.new family,
    /tikzcards/.cd,
    width/.new length = 2.5in,
    height/.new length = 3.5in,
    corner radius/.new length = .125in,
    margin/.new length = .1875in,
    scale/.new value = 1,
    angle/.new value = 0,
    value/.new value,
    flip/.new toggle,
    back color/.new value = black!25,
    text color/.new value = black,
    jitter/.new toggle,
    inner margin/.new length = .1875in,
    draw slot/.new toggle,
    draw card/.new toggle = true,
    dim/.new style = [black!20]{text color = #1},
    seed/.new cmd = \pgfmathsetseed{#1} % Note: Just sets the global seed
}

\newcommand{\cardset}[1]{\options{/tikzcards, #1}}

\newcommand{\tikzcard}[1][]{{
    \cardset{#1}

    \letoption{/tikzcards/width}\width
    \letoption{/tikzcards/height}\height
    \letoption{/tikzcards/margin}\margin
    \letoption{/tikzcards/inner margin}\innermargin
    \letoption{/tikzcards/angle}\angle
    \letoption{/tikzcards/scale}\scale

    \iftoggle{/tikzcards/jitter} {
        \tikzmath {
            \angle = \angle + 5*rand;
            \xoff = 5*rand;
            \yoff = 5*rand;
        }
    }{
        \tikzmath {
            \xoff = 0;
            \yoff = 0;
        }
    }

    \tikzmath{
        \bigtextscale = \scale * 18;
        \smalltextscale = \scale * 3.5;
    }

    \begin{scope}[scale=\scale]

    \iftoggle{/tikzcards/draw slot}{
        \foreach \xsign in {-1,1} {
            \foreach \ysign in {-1,1} {
                \draw (\xsign*.5\width + \xsign*.5\margin,
                    \ysign*.5\height + \ysign*.5\margin -\ysign*2\margin)
                    -- ++(0,\ysign*2\margin) -- ++(-\xsign*2\margin,0)
                    ;
            }
        }
        \draw (0,0) node
            {\scalebox{\bigtextscale}{{\color{black!20}\option{/tikzcards/value}}}}
            ;
    }{}

    % For the bounding box -- the card itself is drawn as an overlay:
    \path (-.5\width,-.5\height) rectangle +(\width, \height);

    % Jitter the card (but not the slot):

    \begin{scope}[overlay]
    \begin{scope}[xshift = \xoff pt, yshift = \yoff pt]
    \begin{scope}[rotate=\angle]

        \iftoggle{/tikzcards/draw card}{

        \draw[very thin,
              fill=white,
              rounded corners=\scale * \option{/tikzcards/corner radius}]
            (-.5\width,-.5\height) rectangle +(\width, \height);

        \iftoggle{/tikzcards/flip}{

            \fill[\option{/tikzcards/back color}]
                (-.5\width + \margin, -.5\height + \margin)
                rectangle (.5\width - \margin, .5\height - \margin)
                ;

            \draw[white, line width = \scale*6pt]
                (-.5\width + \margin + \innermargin + .5\pgflinewidth,
                -.5\height + \margin + \innermargin + .5\pgflinewidth)
                rectangle
                (.5\width - \margin - \innermargin - .5\pgflinewidth,
                .5\height - \margin - \innermargin - .5\pgflinewidth)
                ;

        }{
            \draw (0,0) node[rotate=\angle,\option{/tikzcards/text color}]
                {\scalebox{\bigtextscale}{\option{/tikzcards/value}}}
                ;
            \draw (-.5\width, .5\height) +(+\margin, -\margin)
                node[inner sep=0, anchor=north west, rotate=\angle,
                    \option{/tikzcards/text color}]
                    {\scalebox{\smalltextscale}{\option{/tikzcards/value}}}
                ;
            \draw (.5\width, -.5\height) +(-\margin, +\margin)
                node[inner sep=0, anchor=north west, rotate={\angle+180},
                    \option{/tikzcards/text color}]
                    {\scalebox{\smalltextscale}{\option{/tikzcards/value}}}
                ;
        }
        }{}
    \end{scope}
    \end{scope}
    \end{scope}
    \end{scope}

}}

\newcommand{\card}[1]{\tikz\tikzcard[#1];}

\endinput