There are some synergies with Rainbow Dash and Fluttershy, which is just as weird to write as it is to read
Getting a Mana Leak on a creature would have been one thing, but pay the disturb cost and bask in the glory of uncounterable noncreature spells
There are quite a few other potential commanders in Explorers of the Deep, including Kumena, Tyrant of Orazca
Devour For Power had maybe five cards that let you mill yourself, while Sultai Arisen has 14 at various spots on the curve: Hedron CrabHedron Crab Life from the LoamLife from the Loam Will of the SultaiWill of the Sultai There are 51 cards that mention the graveyard in some capacity, including these excellent grindy midgame pieces: Teval's JudgmentTeval's Judgment Diviner of MistDiviner of Mist Conduit of WorldsConduit of Worlds Kishla SkimmerKishla Skimmer Finally, you need your closers: Lord of ExtinctionLord of Extinction Afterlife from the LoamAfterlife from the Loam Colossal Grave-ReaverColossal Grave-Reaver The deck is just good, not-so-clean, fun with its constant churning of the yard for hijinks and value
But Delney triggers more than just ETB abilities
Ominous Cemetery What can I say