Missing sideboard cards? The full 15-card sideboard runs about $52.77.
Buy sideboard on ManapoolFaerie Macabre exiles cards from graveyards for free (its discard cost), which blunts the graveyard payoffs that Malevolent Rumble feeds, like Emrakul's cost reduction from card types in their graveyard and Shifting Woodland's delirium. It also never costs you a card, since it can be discarded off Faithless Looting. Fire Magic's Fira mode (the {2} additional cost, so three mana total) deals 2 damage to each creature and kills the many 0/1 Eldrazi Spawn tokens. It can scale to Firaga to threaten their small creatures, though it hits your own creatures too, so time it carefully. Burning Inquiry gets worse since they have few hands to punish and Street Wraith is replaceable filler against a deck without much pressure, so trim those for interaction. Keep the core graveyard shell intact since you're the faster clock in this matchup.
This is a graveyard-focused matchup where Faerie Macabre (discard to exile up to two graveyard cards) disrupts Nethergoyf and the delirium needed for Fear of Missing Out at instant speed for free, and it cleans up the cards Stitcher's Supplier mills. Nethergoyf's escape also depends on its owner's graveyard, so exiling it there matters. Shrinking their graveyard can also keep Unholy Heat from reaching its delirium mode if they board it in. Vexing Bauble counters any spell cast with no mana spent, which stops Mishra's Bauble (cast for {0}) and their Flare of Malice when it is cast by sacrificing a creature. That makes it a decent include, but it also counters our own spells cast for no mana, so play around it. Do not cast Hollow One when its cost has been reduced to nothing; keep at least one mana to spend, for example by discarding only two cards first. Hard-cast Blazing Rootwalla for {R} instead of relying on its madness cost of {0}. If Vexing Bauble gets in the way, you can sacrifice it for {1} to draw a card. Burning Inquiry is symmetrical and risks fueling their own graveyard strategies just as much as yours, so trim it along with two Marauding Mako for more targeted disruption. Keep Vengevine and the discard outlets since this matchup is largely a race of graveyard value.
Deafening Silence limits them to one noncreature spell per turn, slowing down their Teferi, Time Raveler plus removal/counterspell sequences and disrupting Day's Undoing or Supreme Verdict turns where they want to follow up. Enter the Avatar State can protect a key threat like Hollow One or Vengevine from their targeted removal (Solitude, Prismatic Ending) by granting hexproof, and the flying, first strike and lifelink help push through a lethal swing. It does nothing against non-targeted sweepers like Wrath of the Skies or Supreme Verdict, so don't count on it to save your board from those. Burning Inquiry is weak against a control deck with few cards they mind discarding and that can punish random discards with Narset, Parter of Veils restricting your card draw, so cut it. Keep your proactive game plan since you want to deploy threats faster than they can assemble their control pieces.