Showdown in the Badlands Cards List & Guide
TauntDeathrattle: Summon arandom 3-Cost Beast.
Say, what's this? Isn't this card supposed to be collectible, like Teacher's Pet is?
No, it's not. It's the special minion made for Book of Heroes (as you can see it doesn't have a watermark) and has a limited pool of generated cards to balance the battles in BoH a little. I've listed them on hs wiki page if you wanna see them. (type Teacher's Pet (boss) there, I didn't manage to post a correct link here)