Hearthpwn

This is an updated version of the original OTK deck - Freeze Mage

Overall concept is the same - you want to get all the cards in your hand you need for a one hit kill. With the new addition of Luna's Pocket Galaxy - you can reduce the cost of Malygos and/or Alex for a slew of different lethal combos. Combine this with Emperor and you can see how quickly a OTK can form.

Some key rules you must adhere to when playing this deck:

• Never mull away Luna's Pocket Galaxy. You want this in your hand ASAP and you want to use it as soon as it's safe (not always necessarily when you can. Sometimes board state demands attention before LPG)
• Try to avoid playing Arcane Intellect before you've played LPG. I've had games ruined because of this
• You don't always need to Alex your opponent before killing them, two fireballs is 12 damage after all
• Sometimes you're going to get bad luck and your doomsayers are on the bottom of your deck. Don't be afraid to just use frost novas and blizzards as methods of stall before you can get an OTK. That's why you have two ice blocks!
• I included a single research project as a way to sometimes mill opponents. Reno Lock, Hand Lock, and Control Priest are the most often affected by this tactic. Look out for it
• Your worst matchups are going to be decks that build a lot of armor. Control Warrior, Control Druid are the worst. This is followed up by other mage matchups as they can also use Ice Block. Reno Mage is particularly difficult - you may want to burst your way through instead and hope for the best, or try to force reno before OTK. 

Here's a demonstration of the deck in action

https://www.youtube.com/watch?v=S55_l3Kqeto

https://www.youtube.com/watch?v=Rgavik3ltsE