Consign to Memory counters colorless spells outright, such as Sowing Mycospawn and Ulamog, the Ceaseless Hunger — a huge blowout if we catch them off Malevolent Rumble setups — and its replicate mode covers multiple colorless spells in one turn. Harbinger of the Seas turns Eldrazi Temple, Ugin's Labyrinth, Cavern of Souls, and Boseiju, Who Endures into Islands, disrupting the colorless mana this deck needs even though it runs plenty of Forest. Stubborn Denial is unreliable since we're rarely ahead on board with a 4-power creature while racing their ramp, and Street Wraith's swampwalk is irrelevant against their Forest-heavy manabase. Keep Thoughtseize to strip Fight Rigging and their eldrazi payoffs before they resolve, and Fatal Push to answer early creatures.

Boros Energy floods the board with cheap creatures, and Brotherhood's End's 3-damage sweeper mode kills Ocelot Pride, Ragavan, Seasoned Pyromancer, Ranger-Captain of Eos, and every Warrior/Cat token they generate, resetting the board after they overextend. Harbinger of the Seas turns their nonbasic lands (Sacred Foundry, Arid Mesa, Flooded Strand, Marsh Flats) into Islands, cutting off the red and white mana they need for Galvanic Discharge and their planeswalkers. Stubborn Denial is unreliable since we rarely have a 4-power creature online early against their fast starts, and Street Wraith's swampwalk is irrelevant against a Plains/Mountain-based deck. Keep Thoughtseize and Fatal Push to proactively strip Blood Moon and their key threats before they take over the game.

Harbinger of the Seas turns their bounce-lands (Simic Growth Chamber, Gruul Turf) and Urza's Saga into Islands, disrupting the green mana Amulet Titan needs to chain Amulet of Vigor triggers and cast Scapeshift or Primeval Titan. Consign to Memory can counter Amulet of Vigor itself, a colorless artifact spell, denying the free-untap engine that powers their whole turn before it starts. Stubborn Denial is unreliable since we're rarely ahead on board with a 4-power creature against a deck that just assembles lands, and Street Wraith's swampwalk does nothing here. Keep Thoughtseize and Fatal Push to strip Primeval Titan or disrupt their Scapeshift/Urza's Saga plan before they go off.