Wasn't sure where to ask this so figured here, in tournaments I know during a round when you play someone you can sideboard cards in between games however in between different rounds can you use a different deck since its another person or must you only use one deck from first round to last?
Mid-Tier: Marchesa Aggro Rose Asmadi Get Dire Tymna Ikra Woke Women Tiana Aura Angel Ruric Thar SMASH Smasher Kraum Mana Positivity Zur Slides
Filthy Casual: WUBRG Jodah WUBRG WUBRG Fatties WUBRG Gahiji Vigilant Vengeance Ezuri Mysterious Morphs