Grixis Reanimator dumps Archon of Cruelty into the graveyard via Faithless Looting or Thought Scour and brings it back with Unearth or Persist, so Grafdigger's Cage and Soulless Jailer both directly shut off that plan by stopping creature cards from entering the battlefield out of the graveyard. Soulless Jailer also denies them casting Unearth itself if it ever ends up in the graveyard trying to be recast from exile or graveyard effects. Vexing Bauble punishes any zero-cost interaction they try to flash in for free. Your top-end threats are too slow against a deck that can reanimate a bomb on turn two or three, so trim them for cheap, proactive graveyard hate.