Dimir Excruciator relies on big graveyard payoffs like Bringer of the Last Gift and Overlord of the Balemurk, so Ghost Vacuum can proactively exile key targets and disrupt their recursive value plan. Duress strips removal like Bitter Triumph before it disrupts our board, which is critical for protecting our aggressive start. Dissection Practice's small pump/drain effect is too low-impact against their bigger creatures, and Dark Knight's Greatsword is slow against a deck full of efficient removal and sweepers like Bringer of the Last Gift's sacrifice trigger.