Tron's maindeck is entirely green and colorless with no red or blue spells to target, so Pyroblast, Hydroblast, and Red/Blue Elemental Blast all stay in the sideboard as dead cards. Extract a Confession gives us a way to force away one of their expensive bombs like Maelstrom Colossus or Bramble Wurm once they resolve, which matters since our burn spells struggle to kill their large toughness creatures. We need to race before Urza's Tron assembles and casts a Cascade-triggering fatty, so we keep every piece of our fast artifact engine intact. This is a pure speed matchup where card velocity and early damage matter most.