If your hand written card is hiding in a sleeve whose to say it can't be used in friendly play
In the library find the card you want, click on the white I in the green box and an image of the card appears, print screen or the snipping tool can be used to capture the image. Snipping tool is better because you can just select what you want as a vector image - makes it easier to resize for printing.
@balgin I will do you one and bring it next time I'm there.
Oh - and I enjoyed flicking though the sample deck builds for ideas