Mulligans
General Mulligans
You should always use your Quest on turn 1, and ideally have minions to play for turn 2 and 3
Eggs are good minions to get out in the first few turns if you draw some buff spells early.
Simplified, this deck has 2 main goals.
Summon Deathrattle minions, buff them with spells, rinse and repeat until Lethal is available.