Mono Black Reanimator vs Eldrazi

Eldrazi runs Chalice of the Void which can shut off our one-mana spells like Thoughtseize and Dark Ritual if set at X=1, so trimming Thoughtseize (dead to Chalice at 1 and they have minimal nonland hand disruption to punish) and some Collective Brutality for cheaper, Chalice-resilient threats and interaction is correct. Witherbloom Apprentice is a cheap two-mana body that provides incidental drain and doesn't trigger off their colorless-heavy spells being countered. Surgical Extraction helps strip a key Thought-Knot Seer or disrupt their Kozilek's Command-fueled graveyard hate before it can exile our Griselbrand or Atraxa, Grand Unifier.