Devotion to Ignis
This deck has to be played defensively. As a suggestion, I replaced 3 Flamestoker for 3 Hellfire to keep this strategy. All of your damage comes from hand and from Blood Singer. There is a lot of synergy, and flexibility using this deck since it has a wide range of answers to many scenarios on board.
Mulligan: Always try to start with Village Elders, Blood Singers, or Ignusi Ritualist. If you have a Ignusi Ritualist in hand as a starter, though it is slow, he is able to ramp lands which makes up for this.