Dimir Tempo leans on Force of Will, Daze, and efficient threats like Murktide Regent's successor-style Moonshadow and Nethergoyf, so we want hard removal that doesn't care about their countermagic once it resolves. Bitter Triumph kills their Orcish Bowmasters or Kaito, Bane of Nightmares outright, and Collective Brutality's discard mode can strip a Daze or Fatal Push from their hand while also shrinking a small Nethergoyf. We shave two fetchlands since this matchup is faster and grindier than most, rewarding spell slots over marginal sequencing flexibility, keeping our full reanimation core intact.