Dimir Midrange is a mono-blue-black control shell with Counterspell, Force of Negation, Spell Snare, and a suite of blue creatures, making Mystical Dispute a cheap, efficient counter against their blue spells. Consign to Memory counters colorless triggered abilities and any colorless spells they might have, while also stopping Orcish Bowmasters' damage trigger when it fires from a draw. A second Emry gives us more card advantage and redundancy to grind through their disruption-heavy hand attacks (Thoughtseize, Fatal Push). We trim Preordain since it doesn't interact with their plan, cut the narrow Pithing Needle, and remove Sink into Stupor for more reliable interaction against their higher density of relevant permanents and spells.