Mulligans
General Mulligans
Kabal Lackey + Netherwind Portal is always a strong start. It lets you take the advantage on the board and might roll you a decent T4 Minion. Also pretty decent with Explosive Runes in mosts of the Matchups since it gives you the advantage at T2 and deals 4-5 direct damage face.
Coin + Arcanologist is also a solid T1, it gives us a super strong minion on the board and lets you draw a useful Secret
If you got the lackey and a decent secret you can also keep Medivh's Valet
Aggro Mulligans
Against aggro espacially aggro druid you absolutely wanna either get Arcane Flakmage or Flame Ward, i used to run the List with only one Flame Ward and one Vaporize instead but because of aggro Druid / DH / Hunter i had to put 2. If you got the Flakmage always keep your Kabal Lackey and a Secret to clean the board and control It.
Mad Scientist is also pretty decent and can make you draw Flame Ward if you didnt get the Flakmage
Control Mulligans
Just go Face Lol, clean the board when its necessary and brainfuck the oppojnent with your Secrets. I actually won many times again Reno / Resurrect Priest because of that.
Budget Mage deck using the Secret Synergy to deal a lot of damage to the opponent and tempo using secrets. I’ve been running this list for some days and got from silver to Diamond 6 in 3 Days. Approx. 70% winrate until Diamond. Goes down to 60 after.