Not on Arena (1): Kili the Resourceful. Arena will skip it on import.
Missing sideboard cards? The full 15-card sideboard runs about $165.
Buy sideboard on ManapoolBRG shares the exact sacrifice/graveyard shell as the Jund Sacrifice list, built around Fanatical Offering, The Sackville-Bagginses, and Vinereap Mentor's Food; Rest in Peace turns off these value loops entirely and exiles their yard on entry. Shattered Acolyte gives us another efficient lifelink attacker with upside against any artifacts or enchantments like Obsessive Pursuit. Doc Ock's Tentacles is too clunky here, Basilisk Collar is weak against their small creature base, and Raubahn's equipment-attach trigger is risky against their cheap removal suite.
Izzet Spellementals wins by chaining cheap spells to reduce the cost of Hearth Elemental and Eddymurk Crab while protecting them with counters like Spell Snare and Get Out, so we need to be fast and resilient. Voice of Victory prevents them from responding to our attacks with instant-speed interaction during our turn, directly disrupting their plan to protect creatures or answer our attackers. Rest in Peace exiles all graveyards, shutting down the cost reduction on Hearth Elemental and Eddymurk Crab. Doc Ock's Tentacles is far too slow against a tempo-combo deck, and Basilisk Collar matters less since we want to close the game quickly rather than grind.
Mono-Green Landfall wants to grow huge threats like Mossborn Hydra and Mightform Harmonizer off landfall triggers, so Erode's unconditional creature removal is excellent at resetting their board before it snowballs. Chainsaw immediately deals 3 damage on entry, which can pick off Llanowar Elves or Sazh's Chocobo, and it gains rev counters as creatures die in this matchup to boost the equipped creature's power. Doc Ock's Tentacles is too slow against their ramp-fueled curve, Basilisk Collar is a lower priority against a deck without much evasion, and one Raubahn comes out for a leaner, more proactive curve.