Dimir Aggro plays efficient removal (Fatal Push, Bitter Triumph, Go for the Throat) and grindy threats like Kaito, Bane of Nightmares and Sheoldred, the Apocalypse, so Scorching Shot is excellent at killing Sheoldred in one card. Kaito is only a creature during his controller's turn, so Scorching Shot, as a sorcery, can't target him on ours. Flowstone Infusion is efficient at trading with their small creatures like Moon-Circuit Hacker and Faerie Miscreant. Monstrous Rage and some Kumano Faces Kakkazan come out since their removal suite punishes pump spells on fragile bodies, and they also run Thoughtseize to disrupt our hand further. Prioritize pressuring before Sheoldred's life-drain and Kaito's card advantage take over the game.