Mulligans
General Mulligans
Keeping quest is obvious
Use Malchezaar's Imp and Tome Tampering to reshuffle your hand and use high-value cards to disrupt your opponent.
Also Augmented Elekk paired with tome+imp combo or Plot Twist can shuffle additional resources to your deck
I put some fun cards as azshara/okani but feel free to replace anything with your favourite card