I like what I'm seeing so far, though design-wise it is somewhat similar to a lot of recent decks. But since those decks were successful, perhaps that's a good thing!
The red design has a one-way back. Those six circles between the cog-like things and the corners, the ones that look like they have alien script characters in them? Along the horizontal line they're symmetrical, but along the vertical line they aren't. The absolute simplest solution is to copy one-half of the card art, rotate it 180 degrees and use that as the other half.
Try an experiment - remove the frames from the courts, simply fading the image edge to white as you approach the edge of the card. That might look pretty sweet.