Panda Exporter does
not support vertex animation.
Panda exporter randomizes the vertex order (as far as I know, but don't quote me on this) when exporting a .X file
out so even if it supported vertex animation then it wouldn't work.
The best way is to rig the card with bones, an easy task to do and i've already highlighted the best export options for Panda
in a previous thread
Another way is to export each frame of the animation and write some code that morphs between the different states of the X files, pointlessly long and expensive though.