Jund fields sturdier bodies (Smaug the Magnificent, Biotech Specialist, Rottenmouth Viper) that can shrug off Plasma Bolt's 2 damage, so swap Plasma Bolt's small burn for Sear's 4 damage to answer their real threats like Smaug and Biotech Specialist. Scorching Shot's 5 damage kills Smaug cleanly, but Rottenmouth Viper is a 6/6 and survives it, so don't count on any single burn spell to handle the Viper. Keep Burst Lightning and Lightning Strike as your flexible removal/reach suite, and keep pressuring their life total before Deadly Precision and Umbral Collar Zealot stabilize the board. This matchup is a race, so don't over-board into clunky answers at the expense of tempo.