Dimir Tempo wants to Thoughtseize your best card, cheat in a cheap threat like Nethergoyf or Bilbo, and protect it with Force of Will and Daze while Wasteland cripples your mana. Null Rod shuts off their Lotus Petal-less but token-generating engines and any artifact-based interaction while doing nothing against your own colorless creatures. Dismember gives cheap, efficient removal for Nethergoyf, Bilbo, or an early Murktide Regent that dodges combat math. Thorn of Amethyst taxes their cheap noncreature spells like Brainstorm, Ponder, Force of Will, and Daze, slowing their disruption. We trim the slower or more situational threats (Sire of Seven Deaths, Eldrazi Linebreaker, and some Glaring Fleshraker) since this matchup is about resolving efficient threats under countermagic rather than going over the top.

This is the Eldrazi mirror, so the game revolves around Chalice of the Void sequencing and Kozilek's Command exiling their key threats. Null Rod shuts off their Lotus Petal-fueled starts and any artifact synergies without hurting our plan since we're not artifact-dependent in the same way. Dismember cleanly kills their Thought-Knot Seer, Reality Smasher (with help), or Eldrazi Linebreaker. Glaring Fleshraker's Spawn generation is one-sided value for its controller, but it doesn't matter much when both sides are racing with big colorless bodies, and Sire of Seven Deaths is too slow against a deck with its own Kozilek's Command exile effects.

Ocelot Pride Midrange goes wide fast with token generation, so Dismember gives us efficient -5/-5 removal to clean up Ocelot Pride, Guide of Souls, or Ajani before they snowball. Thorn of Amethyst taxes their noncreature spells like Swords to Plowshares and Static Prison, slowing their disruption. Sire of Seven Deaths is too slow and expensive against a deck that races with cheap threats and removal, and It That Heralds the End's colorless-cost-reduction upside is irrelevant here. Chalice of the Void at 1 is excellent against their one-mana suite (Ocelot Pride, Swords, Thoughtseize).