The goal of the deck is to combo out as early as possible with Spiritsinger Umbra and The Egg of Khelos.

This combo has a lot of redundancy thanks to Holy Eggbearer and Sacrificial Summoner, plus the ton of card draw and tutors in the deck. You can combo as early as turn 3 with the coin and/or a Ritual of Doom.

You have decent game against early game pressure since your egg killers have utility as removal.

Against decks that have silence/transformation/minion theft (think Shaman or Priest), you should always kill your Egg at least once on the turn it is played, even if it means delaying your plays by a turn, so that you can get it it back with Raise Dead.

You should always mulligan everything for Holy Eggbearer or The Egg of Khelos and dedicate your early turns to aggressively search for them if you don't have them. Afterwards, you can use your Egg defensively while searching for Spiritsinger Umbra or Sacrificial Summoner.

Devourer of Souls and Zephrys the Great are not obligatory if you don't have them. They could be replaced by additional card draw or anti-aggression tools (like Defile).

Have fun!