This is one of the coolest cards out there.
1999 Skybox Premium Star Rubies /50
It is a card that looks like it's moving, even when it's not. It prompted me to mess around with moving images to see if I can capture it. Here's what I came up with.
Stationary image:
And here it is in motion (please forgive the pixelation as the website compresses it pretty severely):
