Jund Wildfire's engine depends on Ichor Wellspring and Fanatical Offering triggering graveyard-adjacent value alongside threats like Refurbished Familiar and Writhing Chrysalis, so Nihil Spellbomb and Relic of Progenitus can exile key graveyard targets, though note Fanatical Offering itself draws cards independent of the graveyard so it won't stop that specific card. Suffocating Fumes' -1/-1 is too small to matter against their sturdier creatures, so it can be cut. Keep your removal suite (Cast Down, Snuff Out, Agony Warp) intact since it answers their creature threats efficiently—note that Snuff Out can target Writhing Chrysalis because devoid makes it colorless, but it cannot target black creatures like Refurbished Familiar. Countering Cleansing Wildfire with Spell Pierce is reasonable but the maindeck copy is enough.