I like it. I could also give you some art if I have time to make it.
Haha, looks pretty cool already, but I would put it on top of the mountain instead of on the side of one. At the start it isn't rolling yet. Like this: _o_ / \The sky is also a bit too happy for an Earth card. Maybe tone down the blue to a darker shade, or just have a plain/arsty monocolor background like in most cards. And make the stone growling rather than smiling . Thanks again.