Tron ramps into huge threats like Maelstrom Colossus (7/7) and Bramble Wurm (7/6), both of which Dark Withering's full cost of {4}{B}{B} can destroy outright since they're nonblack. Nihil Spellbomb can exile their graveyard to deny Bramble Wurm's exile-for-5-life ability and disrupts any recursion, while also being a cheap artifact body that dodges some of their removal. Alms of the Vein's 3-life swing is far too slow against a deck that will eventually bury you in card advantage and huge bodies, so it's cut for actual answers to their threats. This matchup is a race against their ramp, so prioritize killing Expedition Map and Ancient Stirrings targets' payoffs before they hit a third Tron piece.