MarkMckz has a pretty fun Mecha’thun deck that uses it with desk imp and cataclysm to pull off the combo on turn 9. In terms of promotional cards, I would put it on the same level as Sathrovarr. Some interesting applications that won’t fit in every deck.
Thank you for the replies. I think this one will see more play than Silas did due to its versatility. When I think about the maths on this one, you could be putting a lot of value on the board with one move, almost irrespective of which cards gets pulled (if higher than the one you are replacing) and get to recycle, for example, a Battlecry minion for some desirable effect.
Or disrupt the opponent with the risk of doing something similar. Once meta stabilizes and good decks are known, you will know what you will be playing against and that should reduce the risk. It's one of those where you build a deck you want and see if this card adds anything to it rather than build a deck around it.