Grixis Reanimator's whole game plan is Unearth and Persist returning Archon of Cruelty or Emperor of Bones straight from the graveyard to the battlefield. Grafdigger's Cage and Soulless Jailer both shut off creature cards entering the battlefield from the graveyard, stopping Unearth and Persist cold and forcing them to hard-cast their bombs. Dismember cleanly answers Psychic Frog before it starts drawing them cards. We cut Vexing Bauble, since their disruption is mostly hard-cast (Thoughtseize, Fatal Push), and an extra Boseiju for more impactful graveyard hate that actually stops their plan.