Bogles' entire plan revolves around a single hexproof creature (Slippery Bogle, Gladecover Scout, Silhana Ledgewalker) loaded with Auras, so none of our sideboard removal (Pyroblast, Hydroblast, Ancient Grudge, Rolling Thunder) can legally target their hexproof threat. Our best angle is already present: Moment's Peace and Stonehorn Dignitary buy time against their single attacker, while Ghostly Flicker and Mulldrifter-style card advantage out-grind their one-creature clock. No sideboard card improves on what we already have access to, so we keep the 75 as-is rather than bring in narrow cards that can't target hexproof creatures.