Hearthpwn

Crazy simple Boar OTK. I've been destroying DK's all day with it. There are 40 card versions of this out there but I feel like the 40 health doesn't help and having fewer cards helps find your combo more consistently and earlier.

This deck is also very cheap so if you don't many cards you should be able to afford this. Swap Underking with something like Kodo Mount if you can't afford it. You could even drop Wildheart Guff if you don't have it, this combo doesn't require more than 10 mana.

THE PLAN IS SIMPLE: 

1. Draw two copies of Elwynn Boar and at least one copy of Oracle of Elune (you can play two).
2. Kill your board (try to leave 1 minion up for your next turn if possible).
3. Play Unending Swarm to get your board full of boars again. Trade off one minion and play Spammy Arcanist or just trade them into your opponents minions.
4. Smash them in the face with weapon and win. You can also save your second Unending Swarm for a second weapon if you're playing a beefy Blood DK.

TIPS:

• Against blood DK's try to play out the combo before turn 7 to avoid Patchwerk
• Draw the bottom half of your deck with Capture Coldtooth Mine before going for big cards. You do not need Guff for this combo.

TECH:

• Kodo Mount can be a good card to swap in to help kill off your Elwynn Boar and remove some bigger minions.