Mulligans
General Mulligans
Look out for your early ramp cards early on; get rid of everything 5 mana and up
Aggro Mulligans
If you are going up against aggro, you may want to keep a swipe to get rid of a swarm of 1-health minions
A ramp druid deck that has two Old Gods; Y’Shaarj and Yogg. Ramp out early, and play big minions very quickly to get rid of your opponents removal (Priest have Death and Entomb, Warriors have Execute and shield slam, etc.) Once you have worn your opponent out of removal, you drop a scary Y’Shaarj that they have no way to deal with. Use Yogg as a hail mary (from american football) for the chance to win.
Heavy inspiration from Dog’s Yogg and Y’shaarj Druid