I really like this! Simple but not overpowered. The only thing that makes me think is the HP. I understand that without high HP his ability would never be used, but... it's a porcupine!!! 6 HP?!?!?! It's bigger than most dragons!!!
I think it needs some flavor to explain this 6 HP | 10 HP. Maybe it's not a normal porcupine, maybe it is a big rocky porcupine-like creature (and in this case it needs new art!).
Other that this detail, really nice card! Let me know when it's under voting, i will support this!