Hearthpwn

With this deck, I went on a 9 game winstreak, then won two more back to back for 11 wins total.

My last two losses were just unfortunate, where my opponents just drew better than I did. I even got the Kingsbane up with +attack and lifesteal by turn 5, but by that point they had already dropped Golemns and had well established boards.

Mulligans are obvious - basically anything that helps you dig for Kingsbane. Cavern Shinyfinder, Elven Minstrel, or Kingsbane itself.

If you open Shinyfinder or Kingsbane, Mulligan the rest of your hand for draw cards, not buff cards. You can buff your weapon later, but it's important to continually replenish your resources. If on turn 3 you have a Kingsbane with 6 attack but no cards in hand, you're not in a great situation.

Sprint + Preparation is a great combo to open with, if you also open the Weapon.

However, always keep Leeching Poison. It's important to start healing right away since you take a lot of face damage.

If you have Deadly Poison or Toxicologist in your hand late game, hold them until you can play Valeera the Hollow if possible. That way you can use your shadow essence on the buff cards.

Don't be afraid to get aggressive with your Blade Flurry against aggro decks. Even if you have a few attacks left with your weapon, it can be worth a board wipe even if you don't have a way to fish Kingsbane back out.

I like Acidic Swamp Ooze over Gluttonous Ooze because the lower mana cost can help you pull off some combo cards. Plus, you don't really care about your minions, so the buffed attack isn't a game changer.

POSSIBLE SWITCHES:

After completing my run, I think there are a few changes I'd make to get that 12th win.

Shadowstep felt dead most of the time. I might swap it for another Vanish, because that saved me quite a few times.

If you don't have Captain Greenskin, Cutthroat Buccaneer is a good substitute. In fact, I didn't like Greenskin sometimes because if you're in a grind game, you can fatigue your opponent by shuffling Kingsbane back into the deck on an infinite loop, but the weapon gaining durability can screw you since it won't be destroyed fast enough.

Fan of Knives felt a little underwhelming most of the time, but especially compared to Blade Flurry when used offensively. But the draw from Fan of Knives might be too important. I'm going to drop one Fan of Knives and bring Flurry up to two. I'll test this and update.