Mulligans
General Mulligans
Draw your rush minions out, hopefully your weaker ones, and draw through your deck.
Aggro Mulligans
Get your clears to level the playing field, then outvalue with Rush minions. These matchups are fine to waste your spirits on value removal.
Control Mulligans
Get your value generation cards. You need to outlast and outvalue if you're going to win.
Play Spirit Of The Rhino and Oondasta or Boomship; If you played Oondasta, it’s summoning Akali or a war bear from your hand so they’re going to attack again, and if you got Akali it’s going to draw you a cheap rush minion. If you played Boomship, you’re summoning multiple minions and giving them all rush which means they’re all immune. Control the board with the rest of your deck and beat your opponent down with value. Keleseth is also pretty good and buffs all your minions with a nice +1.