In a Commander game, the damage dealt to you by commanders will still be counted, even if that damage doesn't cause you to lose life
Finally, Davriel's Withering really needs "perpetually" to be relevant to be in the conversation since we have one-mana removal like Bloodchief's Thirst and Fatal Push in the format, but it's not impossible that we end up in a meta where giving a specific threat 1/2 forever is important
Other examples of cards that usually warrant grading include: Power Nine cards, generally valuable Reserved List cards, and low-print collectibles like the red neon ink Hidetsugu, Devouring Chaos from Kamigawa: Neon Dynasty or serialized cards from many recent sets
Only one binder can be presented in each trade session
And any end step too - not just yours either, but all of them
Its a good fit in a Grist, the Hunger Tide deck since its already a commander that can dump a lot of cards into the graveyard