Mono-Black Midrange has very few targets for Naturalize: only Cursed Scroll and an animated Mishra's Factory, so cutting both copies is reasonable. Caller of the Claw is a good addition. Its flash lets you cast it at the end of their turn or after your own creatures die, and it creates a 2/2 Bear for each nontoken creature of yours put into your graveyard from the battlefield that turn, such as Mogg Fanatics sacrificed or creatures lost to removal. Only your own creatures count, not theirs. This is especially useful against edict effects like Diabolic Edict and Chainer's Edict, since the Bears give you extra bodies to sacrifice. Watch out for Smother and Snuff Out on your key creatures, and try to play around Duress and Cabal Therapy by not overcommitting your hand. Keep the aggressive goblin plan intact since this matchup rewards applying early pressure.