Cut Down is a fine backup removal spell against their small creatures like Crypt Rats (1/1) and Accursed Marauder (2/1), though their deck already has ample hard removal (Cast Down, Snuff Out, Unmake) for your threats, so this is mainly about applying pressure efficiently. Grim Bauble's -2/-2 also picks off Crypt Rats before it can be activated for damage. Reckoner's Bargain is trimmed since it competes with their own similar sacrifice-value plan (Fanatical Offering, Eviscerator's Insight) and tempo matters more here. Watch out for Crypt Rats as a potential sweeper against your low-toughness artifact creatures and try to play around it when they have {B} mana up.