Tron assembles Urza's Tower, Urza's Mine, and Urza's Power Plant to power out huge threats like Maelstrom Colossus and Bramble Wurm, so Duress can choose noncreature, nonland cards to strip a key piece of the assembly like Ancient Stirrings or Expedition Map before they find their lands, and it can also take their Relic of Progenitus before it strips our graveyard. Faerie Macabre gives us a cheap flying blocker against their large ground creatures and can be discarded to exile target cards from graveyards. We cut Repository Skaab and Architects of Will since this matchup is a race against a slower ramp deck, and proactive disruption of their mana assembly matters far more than incremental card selection.