Tron ramps into Urza's lands to deploy huge threats like Maelstrom Colossus and Bramble Wurm, so countermagic and hard removal are both valuable, but Dispel is weak since they're rarely relying on cheap instants at key windows. Relic of Progenitus provides incidental graveyard disruption and can slow Bramble Wurm's graveyard lifegain, Haunted Fengraf, and any Call Damage Control recursion plans, while Okiba-Gang Shinobi adds a powerful discard-and-damage threat that preys on a deck without much interaction once it resolves. Keep Counterspell and Snuff Out as premium answers to their giant creatures, and use Lorien Revealed/Brainstorm to find answers before they assemble Tron. Plunder the Trollshaws is replaced since raw card advantage matters less than disruption against their top-heavy curve.