Hearthpwn

The goal of this deck was to mill the opponent's deck before you ran out of cards. The key concept is to play Fel Reaver into his mirror entity, silence yours, and keep his alive and surviving with it on board until all his cards are milled. Then you can take control of the board and keep hitting his face and watching him fatigue until you run out of cards yourself.

I used priest because it is strong at stealing large minions, destroying large minions, board clears, healing, and swapping the treasure's attack and health to obtain them quickly. Other classes are possible with other advantages, such as Paladin's ability to reduce the Fel Reaver or large minions to 1 attack.

I used glacial shard to freeze the Fel Reaver for a turn. Using swift messenger to deal 6 damage to the fel reaver can be used in combination with the hero power swapping attack and health to turn the 8/8 to an 8/2 and a 2/8. This helps the fel reaver survive while reducing your face damage. Plague of death is your best way to reset the board, mind control is best for stealing his large minions, entomb is great for stealing minions and delaying your fatigue. Lady in white is for the 2/6's of swift messenger and convincing infiltrator, but definitely not necessary. Convincing infiltrator stalls and can destroy large minions. Greater healing potion is the largest heal, and omega medic can be used for early tempo or late game heal. Crazed alchemist can be used to steal treasures, but it is not needed because you already have that hero power. I use the 0 mana silence instead of the 5 mana 5/5 silence so I can be more efficient with playing the fel reaver and silencing mine on the same turn, and sometimes I was afraid of playing the 5 mana 5/5 into mirror entity, so I was stuck holding that card.

Notes:

Playing a 1/1 stormwind after stealing it with entomb will lead to it growing according to his weapon - you controlling it doesn't change that. If he has a 0/X taunt, switching the attack and health leads to an X/X taunt or maybe one X is X-1, but either way you don't kill it, which doesn't make sense but just know that so you aren't surprised and tilted.

Overall, there are many decks that could accomplish the same thing more efficiently. This is just the first version that I was successful with.

Here is my full game - I'm glad Hearthstone Deck Tracker allows support for games against unusual heroes! I was lucky with the treasures - particularly when I could swap my cards for those in my deck that were better for stalling, and when I found the treasure that kept me alive for 10 more turns past fatigue!

https://hsreplay.net/replay/dN65GAqEUhD37s5daR7ymj

If anyone has other game breaking ideas for storming stormwind, please let me know! I'm going to test warrior with dead man's hand and see how long I can go for!