Eldrazi has few relevant cards in hand to strip (lots of mana rocks and lands), and Chalice of the Void set at X=0 or X=1 can blank Dark Ritual and Lotus Petal, so discard spells lose value. Bitter Triumph gives us clean removal for creatures like Thought-Knot Seer and Reality Smasher (Reality Smasher counters the spell unless we discard a card, and Sire of Seven Deaths has Ward—Pay 7 life, so be ready to pay). Collective Brutality's -2/-2 handles smaller creatures such as Glaring Fleshraker and Wastescape Battlemage, and its discard mode can take a Kozilek's Command. Keep Thoughtseize in since it can still strip a key Chalice or Kozilek's Command before it lands. The matchup is about resolving a big threat before Chalice locks us out, so prioritize speed over additional discard.