\documentclass{standalone}
\usepackage[english]{babel}
\input{common.tex}

\begin{document}
\begin{tikzpicture}
\cardtypeSpell{Discount!}
\cardbuycost{5}
\cardcontent{This turn you may buy an additional card and buying cards cost half their buying cost, rounded up}
\cardplaycost{2}
\cardmodule{exp1}
\cardborder
\end{tikzpicture}
\end{document}