Mulligans
General Mulligans
Kingsbane is always the best option to begin buffing up and hitting for face damage or combo with Leeching Poison to take out minions.
Aggro Mulligans
Kingsbane can save you in an ago matchup, especially when you begin to gain health while killing minions. Doomsayer is a good board clear, or at worst allows you another turn to buff your weapon.
Midrange Mulligans
The most important part against Midrange decks is to have minions to trade into, and 4/4 bodies are perfect for that. Kingsbane, once again, can begin to remove their minions at no health cost so if the opportunity presents itself to get a Deadly Poison off on Kingsbane always take it.
Control Mulligans
Mill is extremely important here, and Rogue has very strong minion removal cards. Always keep Coldlight Oracle and Fal'dorei Strider in matchups such as this, as it is important to gain this win condition.
Unlike many other mill rogue decks, this has the ability to take an aggressive stance with Kingsbane. Currently experimenting with Valeera the Hollow as I’m not entirely sure it is the best choice for this deck. Using Valeera can pay off, but it also limits your ability to win in fatigue (you can build your deck entirely of Kingsbanes, however they don’t all have the same enchantments). Valeera with Leeroy Jenkins is a 12 damage finisher, and is typically too good to pass up though.