In short, he becomes a draw engine, he fills our graveyard (which is great for our Esper Zombie Tribal), and by attacking on its own he buffs our Zombies with +2/+2 (normal card draw on upkeep + his card draw on attack trigger)
You can find all of the decklists right here
8 Duskmourn: House Of Horror Commander Deck - Jump Scare
The other 58 cards on The List for this set were chosen to complement the narrative and mechanical themes of the set. Also included in The List, is a new chase card, featuring the sets golden age treatment Rafiq, of the Many
Additionally, TCGplayer has very good customer support, and also offers TCGplayer direct, where they handle the shipping and handling etc
This works specifically, whenever you cast instants or spells on a creature you control, allowing you to exile the card after resolving it, instead of putting it in your graveyard to then be put back into your hand on the next end step