(Today's list will only have one card.) Best as a Commander - This category covers, as advertised, the best commander to lead a deck in Commander, but may also look briefly at other Command Zone-driven formats
Whenever a creature receives damage, it sticks around on the creature until the end of the turn, so it's possible to slowly kill a creature by dealing damage several times during a turn
Tasha, the Witch Queen can be your commander
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