Missing sideboard cards? The full 15-card sideboard runs about $18.85.
Buy sideboard on ManapoolOcelot Pride Midrange wants to flood the board with Cat tokens and lifelink triggers, so Pithing Needle can shut off Ocelot Pride's activated-style engines are limited, but it's excellent on Goblin Bombardment or a problematic Karakas. Twinshot Sniper's 2 damage on entry kills Guide of Souls (1/2) or an early Ocelot Pride (1/1), and Abrade's 3 damage handles Ajani, Nacatl Pariah (1/2) or Voice of Victory tokens (1/1) while also hitting a stray artifact. Haywire Mite can exile Goblin Bombardment or another troublesome noncreature permanent after attacking into a board. Cut slow, low-impact cantrips for cards that interact with their board state directly.
Eldrazi's Chalice of the Void can lock our cheap artifact spells (Lotus Petal, Mishra's Bauble, Mox Opal) if set to 0, so Abrade's ability to destroy target artifact gives us a way to remove a Chalice set against us, and Haywire Mite does the same by exiling it (it needs {G}, available from Lotus Petal or Mox Opal) while also gaining 2 life when it dies. Pithing Needle can't name Eldrazi Temple, because its mana ability is unaffected by Needle, and Kozilek's Command is a spell with no activated abilities, so Needle does nothing against it either. Needle is better saved for a land with a real activated ability, such as Eye of Ugin's tutoring or Abundant Countryside's token-making. Trim the weak cantrip artifacts and Skateboard, since this matchup is about resolving a critical mass of threats before Thought-Knot Seer and company take over the board.
Lands wins through Dark Depths plus Thespian's Stage for a 20/20 indestructible Marit Lage token, and grinds with Life from the Loam plus Wasteland effects, so proactive artifact/land hate matters. Pithing Needle can shut down Dark Depths' ice-counter removal ability or a repeatable Thespian's Stage copy effect before Marit Lage appears. Abrade destroys an artifact like Mox Diamond or an Expedition Map, and Haywire Mite can exile Dark Depths-adjacent permanents like The Filigree Sylex or another noncreature threat while gaining 2 life. Keep our full land count and core engine since this is a grindy matchup where resource denial from Wasteland makes consistency essential.