Jund Wildfire's engine revolves around artifacts generating card advantage (Ichor Wellspring, Nihil Spellbomb) and Cleansing Wildfire destroying your Gates to disrupt your mana, so Deglamer and Dust to Dust come in to answer those pieces efficiently before they spiral. Sacred Cat is cut because Krark-Clan Shaman can repeatedly sacrifice artifacts to ping all ground creatures for 1 damage, making any 1-toughness creature a liability; Malevolent Rumble is too slow when you need proactive interaction. Guardian of the Guildpact is your premier threat here—it dodges Cast Down and most of their removal suite due to protection from monocolored—so prioritize getting Armadillo Cloak on it to generate a life total cushion they can't easily overcome. Keep Prismatic Strands up against their creature attacks, and use Journey to Nowhere on Krark-Clan Shaman or Writhing Chrysalis to shut down their sacrifice and token generation.