Mulligans
General Mulligans
You want your priority Buff minions to be on the most left in your hand. Hir'eek especially.
Keep Spirit of the bat in hand to combo mid to late game.
Buff your hand
Buff Priority
1. Hir’eek
2. Doubling imp
3. Omega agent
Save the Spark from the Spark engine to use with Spirit of the bat.
When Spirit of the bat is on the field, use Fiendish circle then defile to gain a 4/4 buff to a minion in your hand.