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
As a 3 star monster with low attack, Tsuchinoko inherently provides little value
Black is interesting because instead of denying our opponents mana or preventing them from casting certain spells, we can just strip them of their hand with cards like Arterial Flow and Painful Quandary
Play Booster Boxes (including 12 packs) aren't much better, reaching close to $1000 on the resale market right now, so buying in bulk isnt exactly economical either
The Dark Side of Dimensions Movie Pack Yu-Gi-Oh
Its no wonder its a staple in so many Commander decks