Mono Black Aggro is an all-creature deck with virtually nothing for Duress to hit, so it comes out in favor of blockers and a sweeper. Preacher of the Schism's deathtouch profitably blocks their small aggressive creatures like Forsaken Miner, Iridescent Vinelasher, and Nighthowl Pursuer. Day of Black Sun wipes their whole low-curve board, since pumping power or toughness with effects like Desolation Prowler's activated ability does not raise mana value and let creatures dodge it. Stock Up is too slow against this fast aggressive clock, so trim it for more immediate impact on the board.