This is my favorite Tron brew in the current format for modern. AspiringSpike completed the list as I was tinkering with a similar idea. It uses a combination of Grinding Station, Scrap Trawler, and Myr Retriever to make an infinite loop to mill out an opponent.
4 Semblance Anvil 4 Expedition Map 4 Chromatic Star 4 Chromatic Sphere 4 Mystic Forge 4 Grinding Station 4 Ichor Wellspring 4 Scrap Trawler 4 Myr Retriever 4 Urza's Power Plant 4 Urza's Tower 4 Urza's Mine 3 Forest 1 Blast Zone 4 Karn, the Great Creator 4 Ancient Stirrings 1 Chalice of the Void 1 Relic of Progenitus 1 Pithing Needle 1 Altar of Dementia 1 Torpor Orb 1 Liquimetal Coating 1 The Stone Brain 1 Trinisphere 1 Ensnaring Bridge 1 Spine of Ish Sah 1 Haywire Mite 1 Spellskite 1 Soulless Jailer 1 Platinum Angel 1 Sundering Titan