One thing I really hate facing down in Commander is a combination of cards that makes an opponents battlefield unassailable, usually involving cards like Avacyn, Angel of Hope
Grey Merchant of Asphodel was a real boost to Necropotence as it is a powerful effect regardless of the lifegain and has good devotion synergy with Necro
With thousands of hours in League of Legends, Overwatch, Minecraft, and countless survival, strategy, roguelike, and RPG entries, she still finds time for offline hobbies like tabletop RPGs, wargaming, miniatures painting, and hockey.
So, graveyard hate cards work like a charm
Varragoth, Bloodsky Sire - Vampiric Tutor on a creature (without the life loss)