Jund Wildfire's entire game plan runs through sacrificing artifacts like Ichor Wellspring to Fanatical Offering for card advantage, so the extra Mesmeric Fiends strip their key enablers before they can be cast or sacrificed for value. Faerie Macabre lets you proactively exile cards from their graveyard, denying flashback value from Eviscerator's Insight. Tinder Wall and Lotus Petal are low-impact mana accelerants that don't advance the sacrifice-hate plan and can be trimmed since your curve is already well-supported by Overgrown Battlement, Wall of Roots, and Saruli Caretaker. Keep Masked Vandal in the maindeck as-is since it already threatens their Bridges and artifacts by exiling them, so no adjustment is needed there this round.