Missing sideboard cards? The full 15-card sideboard runs about $85.51.
Buy sideboard on ManapoolOcelot Pride Midrange goes wide fast with Cat tokens, Voice of Victory Warriors, and Ajani's token generation, so Ensnaring Bridge can lock out their swarm of small attackers once we have an empty-ish hand or control the board state to keep it relevant. Perilous Snare exiles their most important nonland threat (Ocelot Pride, Ajani, Guide of Souls) while we work toward our combo. Liquimetal Coating gives us a way to turn an opposing nonbasic land such as Wasteland or Karakas into an artifact until end of turn, which shuts off its activated abilities while Karn, the Great Creator is on the battlefield. Watch out for their Wasteland hitting our nonbasic lands; Karakas can't bounce our planeswalkers since it only returns legendary creatures, but it can save their own Ajani by bouncing it. Prioritize resolving The One Ring for protection against their aggressive curve.
Dimir Tempo relies on Murktide Regent's delve and Nethergoyf's graveyard-based power/toughness, so Surgical Extraction and Tormod's Crypt directly attack both those payoffs by emptying the graveyard they need. This is a grindy matchup against free countermagic (Force of Will, Daze) and discard (Thoughtseize), so we want to keep our card-advantage engines like The One Ring and Kozilek's Command online rather than diluting with narrow answers. Their Wasteland can be painful against our nonbasic-heavy manabase, so sequence Ancient Tomb and basics carefully. Graveyard hate also denies value from their Mishra's Bauble delve fuel indirectly by thinning resources they can lean on late.
Sultai Aluren's mana dorks (Birds of Paradise, Ignoble Hierarch) and small creatures like Badgermole Cub and Dryad Arbor die cleanly to Dismember's -5/-5, helping us survive their Gaea's Cradle/Craterhoof Behemoth overrun plan. Torpor Orb turns off the enter-the-battlefield triggers on Badgermole Cub's earthbend and other value creatures, disrupting their ramp chain before they reach Natural Order or Green Sun's Zenith payoffs. We keep our artifact mana base intact since they have limited ways (Collector Ouphe as a one-of) to interact with our Grim Monolith/Mystic Forge engine directly. Their Wasteland and Verdant Catacombs-fetched lands can pressure our mana, so prioritize assembling Urza's Saga quickly.