A Dredge/Delve Deck that focuses on Casting Soulflayer with a plethora of keyword abilities.
Elvish Mystic, Sylvan Caryatid, and Satyr Wayfinder are the primary ramp sources for this deck. With Wayfinder getting creatures in the graveyard and Caryatid providing Hexproof for Soulflayer.
Gurmag Swiftwing is a pretty odd choice but being 2 drop creature with 3 useful keyword abilities (especially haste) makes him worth while in Soulflayer Shenanigans.
Nyx Weaver helps dredge creatures into the grave while being able to grave tutor any needed Soulflayers.
While legendary, Having 4 Pharika, God of Affliction is beneficial as it gives Soulflayer Indestructible when delved. It is also a strong, cheap threat on it's own right that can gain devotion and also make snakes out of mystics and satyrs that don't offer any boosts to Soulflayer. Plus, she can be Exploited by Sidisi, Undead Vizier not only adding Pharika to the grave but tutoring Soulflayer.
Chromanticore has 5 keyword abilities but also five colors. Good in the grave but bad in the hand. Although with Caryatids and mana confluence I can hard cast him (this is not ideal or practical by any means) He is the only card that is more often or not a dead card in hand but essential to the Soulflayer Strategy.
I'm also unsure of how to sideboard in this kind of deck but I can see control decks being a hindrance.