\documentclass[a4paper,landscape]{article}

%   Ränder des Dokuments anpassen                                                
\usepackage[margin=6mm,top=5mm]{geometry}

% Pakete dazuladen
\input{libs.tex}
% Farbdefinitionen laden
\input{colors.tex}
% \card-Commands laden
\input{tikzcards.tex}

\usepackage{standalone}

\begin{document}
\begin{center}
\pagestyle{empty}
\input{cards/fisher.tex}
\hspace{5mm}
\input{cards/fish_trap.tex}
\hspace{5mm}
\input{cards/sailor.tex}
\hspace{5mm}
\input{cards/captain.tex}
\vspace{5mm}

\input{cards/barge.tex}
\hspace{5mm}
\input{cards/galley.tex}
\hspace{5mm}

\end{center}
\end{document}