Boros Dwarves relies heavily on Equipment like Leyline Axe, Lavaspur Boots, and Doc Ock's Tentacles, so Pyrrhic Strike's ability to destroy an artifact or enchantment answers their key equipment pieces or Dragonfire Blade. Ghost Vacuum can exile cards from their graveyard, slowing recursive value and doubling as a late-game spirit generator, though it mainly comes in for grindy games. Liliana the Faultless is a 1/1 that dies instantly to their aggressive creatures and doesn't impact the board fast enough, and Essence Channeler trades poorly into their efficient attackers, so both are cut for more targeted artifact answers.