Mulligans
General Mulligans
Get your early battlecries, your draw, and your value.
Aggro Mulligans
get scheme early, destroy the board, Lackeys and value
Combo Mulligans
As said you can slot in combo breaker battlecries to make it better. Shudderwock will repeat those when you need them
Control Mulligans
You're going to need scheme early, so it gets strong. EVIL Totem should generate a bit more value against control. Earthquake should generate some decent value and clear small deathrattles. Krag'Wa can get you these spells right back
The goal of this deck is to use your lackeys and battlecries to complete quests and get double battlecries to use for value generation. If you are in a matchup where you can save the coin, you can hero power coin shudderwock in the late game for double battlecries and lots of face damage.
Possible cuts I might make: Cable Rat if there’s better Lackey generators, Krag’Wa (only really gives you back your Witch’s Brew and AoE) Shudderwock is winmore
Replacements depending on the meta: Spell combo heavy meta you can probably fit in a Saboteur, minion heavy combo you can use a hecklebot