Hearthpwn

Kingsbane has always struggled with drawing into fatigue if the game lasts long enough.
Prince Renathal fixes that problem, and adds easier combo triggering on stuff like Raiding Party and Tinker Oil, plus some neat value.

Mulligan and Playstyle:
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These stay pretty much the same as normal Kingsbane.
Always keep one weapon tutor in a mulligan (Cavern Shinyfinder or Raiding Party). It's typically best to mulligan away Kingsbane. Dropping a Buccaneer on turn 1 is good, but don't expect it to survive! Coining or prepping Raiding Party is bonkers. Drawing Renathal or Patches is feels-bad, but definitely survivable, so don't concede or anything!

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The 9 added cards:
+ 2 Counterfeit Coin - (Combo trigger/Preparation electric boogaloo)
+ 2 Gone Fishin' - (combo trigger and draw consistency)
+ second copies of Paralytic Poison and Swindle - (consistency)
+ Edwin VanCleef - (MASSIVE value drop with a good hand, can easily get really big because of the low mana average in the deck)
+ 2 SI:7 Extortion - (combo trigger or extra draw)

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Possible changes:
If you're matching with a lot of big-minion decks, Blade Flurry could be useful. 
I considered Foxy Fraud for a while, but I believe Preps and Coins are far more useful than a 0 mana 3/2. Nitroboost Poison would be great, but... Corrupting it seems really difficult with the current list.

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Success rate: So far its doing great! Great against the popular renathal warlock variations right now. I'll update this every so often if this gets any traction.