Mulligans
General Mulligans
if Rivendare is ever silenced we can use Nine Lives to trigger its deathrattle into Flark's Boom-Zooka on turn 10 for a otk (depending on what you're fighting it might be handy to bring another one for the extra draw chance)
Combo Mulligans
to kill Rivendare we can use goblin prank OR hunters mark + a damage card of choice, typically goblin prank is the better choice due to it only using one card over your control based cards, but depending on the situation you can use the other method
Control Mulligans
we can use these cards to control the board for a while
a deck utilizing Rivendare, Warrider with Flark's Boom-Zooka for a OTK
love the idea, ran by a deck similar to this in wild and it blew my mind