Claim the Firstborn and Bloodtithe Harvester are weak since Dimir Self-Bounce runs few creatures worth stealing or shrinking, mostly small value enchantment creatures like Fear of Isolation. Thoughtseize proactively strips their bounce spells (Boomerang Basics, This Town Ain't Big Enough) or Narset, Parter of Veils before they can lock down our card flow. Go Blank punishes their card-heavy hand while also clearing their graveyard, which blunts Stormchaser's Talent returning an instant or sorcery at level 2. Keep Mayhem Devil and the full sacrifice package, as our proactive clock is faster than their grindy bounce-based value plan.