Underrated for sure. Kill mid-sized minion + leave a taunt up to kill another mid-sized minion? I mean this is unlikely to make it in a deck, but this is the best pack filler I have ever seen to the point I think it might not be a pack filler at all. Would not be totally shocked to see it in taunt warrior. I see a beast subtheme emerging there.
I recently added two of these along with Oondasta to my odd Mage. Oondasta also synergizes with Baku in an effective way. Instead of spending 9 Mana to bring out a vanilla Baku, you get a 7/7 rush AND either a 5/7 rush/taunt or also leaving Baku on the board. It actually works out well most of the time.