mtg cards that return graveyard to library Trading Card Game Eternal Masters Rare Diminishing Returns #46 Then each player draws up to seven cards. Evolution Charm [Planar Chaos]

Since Innistrad: Midnight Hunt focuses on Werewolves, Arlinns return could be quite likely

Harrows the classic, and it puts lands into play untapped but also folds hard to counterspells

If you can find a way to untap it for less than 3 mana, you can make infinite colorless mana

Mother of Runes Mother of Runes (AKA Mom) is the ultimate protection machine, and quite the effective rattlesnake

He also gets to come back from the grave if a vehicle connects

So in a Commander context, I see discard as the best way to describe a swathe of interdependent synergistic mechanics, mostly based in black, which look for advantage by quickly pitching their own hand to the graveyard