Dimir Midrange is grindy with countermagic like Spell Pierce and Spell Snare plus removal like Bitter Triumph and Requiting Hex, so we want resilient, mana-efficient threats. Page, Loose Leaf gives us cheap artifact bodies that provide long-game card advantage via Grandeur, though watch for Requiting Hex. The extra Tezzeret, Cruel Captain is a strong grindy planeswalker against their removal-heavy shell. Ghost Vacuum lets us exile cards from graveyards and potentially reanimate opposing creatures later. Cut narrow anti-aggro tools like Lodestone Needle and Dusk Rose Reliquary that are weaker against a deck without cheap creature swarms.