From Kirk Hedden:
Lord of the Deck is a card and deck management program for the Magic: the Gathering card game. With this latest version (4.0), it has been rewritten using the Java programming language, enabling it to run on most modern computing platforms. The current build has only been compiled for the Mac OS X operating system. Linux and Windows builds will appear in time. Since this version of Lord of the Deck relies heavily on the Java 2 language, it will not run on the 'Classic' Mac OS (i.e. OS 9) since that OS does not support Java 2.