Up to 12 damage for a 3 cost common seems a bit high, no? I do like the idea but it seems likely to be overpowered in its current form.
To compare: Beast mistress does 12-17 damage for 5 recruits. And is a rare card.
EDIT: I didn't calculate in the Beast keyword, which makes the actual value 12-27, so there is a reasonable difference between these two. Perhaps I rushed to conclusions with my first impression.