Grixis Reanimator's game plan is to pitch Archon of Cruelty or Abhorrent Oculus via Faithless Looting or Thought Scour and reanimate as early as turn 2 with Persist or Unearth, so the primary goal post-board is to have hard answers to those reanimation spells before they resolve. Consign to Memory is your best card here — it counters Persist and Unearth outright and can exile the graveyard at instant speed to shut off future attempts, and it also gives you additional protection against their own Consign to Memory in the counterspell wars games 2 and 3. Flusterstorm is exceptional against their sorcery-heavy disruption package, stopping Thoughtseize from stripping your combo pieces while also countering Faithless Looting, Persist, and Unearth at a mana-efficient rate. Tormod's Crypt comes in as a free fetchable graveyard exile target for Whir of Invention, threatening to blank their entire setup the moment it resolves. Stern Scolding and Spell Snare are cut because their size and mana-cost restrictions rarely line up against the large reanimation targets and key sorceries, and Into the Flood Maw is trimmed in favor of stopping threats before they resolve rather than bouncing what slips through.