Mulligans
General Mulligans
Just take any spell at the start you don't want to draw into your high cost minions until ramp or vandar. Also try to snipe as many copies of Hedge maze with moonlight as you can.
Aggro Mulligans
For aggro you may want to hold a rush minion especially going second. In general not very good vs aggro but you can luck out with some good summons.
Uses Ramp and Vandar to cheat out deathrattle minons and colosals from deck.