This matchup is a race against their colorless Eldrazi and artifact-land engine (Urza's Saga, Eldrazi Temple, Ugin's Labyrinth) plus big threats like Emrakul, the Promised End. Toxic Deluge is a sweeper that can wipe their early Basking Broodscale, Glaring Fleshraker, and Eldrazi Spawn tokens even through adapt counters since -X/-X ignores toughness boosts if X is large enough. Nihil Spellbomb and Engineered Explosives answer their colorless permanents and can hit Urza's Saga tokens or graveyard recursion pieces. Sheoldred's Edict is weak here since they can sacrifice a token, and Quantum Riddler is too slow against their proactive land-based value engine.

Izzet Prowess is a fast aggressive deck full of colorless cantrips (Mishra's Bauble) and cheap creatures, making Consign to Memory excellent since it counters both colorless spells and triggered abilities like Cori-Steel Cutter's Flurry. Stern Scolding cleanly answers Dragon's Rage Channeler, Monastery Swiftspear, and Slickshot Show-Off, all with power or toughness 2 or less. Force of Negation is often dead on the play against a deck full of creature spells it can't hit, so we trim it, and Spell Snare is less impactful since few of their key spells cost exactly two. Mystical Dispute is cheap versus their blue Expressive Iteration and any counterspells they bring in.

Esper Blink relies heavily on Flickerwisp, Phelia, Exuberant Shepherd, and Ephemerate chains alongside fetch lands, so Harbinger of the Seas turning off their nonbasic lands (making them all Islands) disrupts their mana while still letting us cast our own spells fine off basics and Islands. Dress Down strips abilities from their evoked Solitude or blinked Witch Enchanter before the trigger matters, and can blank a freshly blinked Overlord of the Balemurk's mill/return trigger if timed right on the creature itself. Sheoldred's Edict is weak against a token-light, resilient creature shell, so it comes out along with a slow Flow State and a fair Quantum Riddler in a grindy matchup where our removal and discard suite already lines up well.