Golgari Midrange plays a curve of efficient creatures like Gollum, Riddle Master and Rhovanion Rampager alongside removal like Bitter Triumph and Maelstrom Pulse, so Duress proactively strips their removal or a key planeswalker like Professor Dellian Fel before it resolves. Day of Black Sun sweeps their early-to-midsize creature base while our top-end threats survive at a higher X. Countermagic like We Say Thee Nay!, Spell Pierce, and Spell Snare is weak since this is a grindy creature matchup where cards already on the battlefield can't be countered. Keep our removal suite and Enduring Curiosity in, since card advantage and efficient removal are key against their resilient threats.