Deck is pretty self-explanatory, just press button and hit face to win. Many of these cards are mean to be fast or difficult to remove.
Mulligans: Lowly Squire is always a good keep. You will always hero power on turn 2, so it is guaranteed to be a 2/2m You more than likely want at least two 1-drops in the opening hand and a 3-drop (anything but Kill Command)
The Blackwald Pixies are your flex spots. I like Pixie because I'm greedy and it acts as a good turn 7 play, allowing you to deal 6 damage to face. However, depending on your meta, tech choices such as Ironbeak Owl.and Gluttonous Ooze are encouraged as replacements.