Jund Wildfire is stuffed with artifacts (Ichor Wellspring, Nihil Spellbomb, Drossforge Bridge, Slagwoods Bridge) though the Bridges are indestructible, so Smash to Smithereens should target Ichor Wellspring or Nihil Spellbomb to deny value and hit them for 3. Relic of Progenitus disrupts their Cast Down-into-Eviscerator's Insight and Fanatical Offering sacrifice-and-recur value engines, and can proactively exile their own graveyard resources like Writhing Chrysalis or Refurbished Familiar fuel. Trim the slower card draw spells since this matchup rewards proactive damage and disruption over grindy card advantage. Keep the core engine since this is a race we can win before their sacrifice loop overwhelms us with card advantage.