Chatterfangs ability can be used to remove problematic creatures with smaller amounts of Toughness like Grand Abolisher
Three mana to get a basic, Sphere, or Locus into hand might seem a little expensive, but its a step along the way to creating a very scary creature
Staples Tutors (Vampiric Tutor, Demonic Tutor, Grim Tutor, Increasing Ambition, Diabolic Revelation) These are all obviously pretty incredible, to the point that multicolored black decks are becoming much harder to build due to lacking open slots for the actual spells
Unlike the Reparations spike, this is an MTG price jump you can expect to stick
At the very least, you could cast Triskaidekaphile as 1/3 Creature for 2 Mana that lets you have unlimited hand size, accompanied by a late-game Mana sink that lets you draw cards thats pretty decent as it is