Death and Taxes applies constant small-creature pressure with Thalia, Guardian of Thraben taxing our noncreature spells and Wasteland/Karakas disrupting our manabase, so Ensnaring Bridge is excellent against their go-wide plan of Cat tokens and 1-2 toughness bodies once our hand is empty. Dismember cleanly answers Stoneforge Mystic, Thalia, or Skyclave Apparition at instant speed for minimal mana even under a Thalia tax. Mycosynth Lattice turns all their lands into artifacts, making Wasteland and Karakas vulnerable to our own artifact-based disruption and letting us cast anything off any land, which is a strong late-game lock piece Karn can find. We trim Portent of Calamity, Thundertrap Trainer, one Expedition Map, and one Grim Monolith since Thalia taxes our fast mana plays and we'd rather prioritize resilient threats and lock pieces.