UBG reanimator strategies live and die by putting creatures into play without casting them via Animate Dead, Reanimate, and Goryo's Vengeance, and Containment Priest exiles any such nontoken creature on the spot, completely blanking Griselbrand and Atraxa reanimation. Consign to Memory can counter their graveyard-fueling triggered abilities like Stitcher's Supplier's mill trigger or counter colorless spells they may run, and gives us cheap flexible interaction. We trim Force of Negation since it cannot counter creature enablers, and Prismatic Ending is often too slow against a deck that can go off before we untap.