Tron wants to assemble its lands and deploy huge threats like Maelstrom Colossus and Bramble Wurm while using Giant's Boulder and Expedition Map for value, so Suplex is efficient removal that can kill a 3/3 like Rooftop Percher or a prototyped Boulderbranch Golem, or exile an artifact like Expedition Map or Giant's Boulder to slow their assembly, with the bonus of exiling the creatures it kills so they can't be recurred. Deglamer is a cheap instant answer to their artifacts, including Pinnacle Kill-Ship, Maelstrom Colossus, and Giant's Boulder, shuffling them back into their library. We're cutting our slowest cards since the matchup is a race to pressure them before Urza's Tron comes fully online and they overwhelm us with card advantage and giant threats.