Dimir Hogaak brings a wall of free countermagic (Daze, Force of Will) and disruption (Orcish Bowmasters, Fatal Push); Thoughtseize lets us proactively strip a counterspell or Orcish Bowmasters before we go off, which Cabal Therapy can't reliably do on an empty board turn one. Cabal Therapy requires guessing a card name and sacrificing a creature, which is clunky against a deck we often can't out-grind; Thoughtseize is simply a cleaner, more flexible disruption spell here. Destroy the Evidence is far too slow against a tempo-oriented graveyard deck that will have already won or stabilized before it matters. Keep the core combo package untouched since our main plan is still to race them before Hogaak, Arisen Necropolis comes down.