Hearthpwn

I'm not sure how competitive this deck is, but it's pretty fun for sure. Also, this OTK was not my idea. Someone on here made a post about it when Metamorphosis was first announced.

The combo goes as follows:

Use an Emperor Thaurissan tick on Clockwork Automaton, Garrison Commander, and Prince Taldaram.

Then, play Metamorphosis the turn before this. As a result, you have a 9-mana (4 + 2 + 1 + 1 + 1) combo that deals 40 damage. 

Another interesting thing I've noticed about this deck is that you don't necessarily need to do the combo to win every time. If you use Metamorphosis, then the next turn you simply place down your Clockwork Automaton and copy it with Prince Taldaram, that's instantly a 20-damage burst for 9 mana.

I also threw a dragon package in there because I didn't know what else to fill it up with. I've also noticed Firetree Witchdoctor can pull some nice spells, INCLUDING Metamorphosis. 

Check out this deck if you can! I've had some fun with it, and hopefully you do too.

One last thing, I can see this deck struggling against Aggro early on, specifically Secret Mage. Add an Eater of Secrets in there if you need to.