Dimir Midrange grinds with discard (Thoughtseize), removal (Fatal Push, Sheoldred's Edict), and card advantage engines like Narset, Parter of Veils, so protecting your threats and generating extra value matters more than clunky bounce. Spell Pierce protects key spells from their removal suite and punishes their 2-mana plays like Narset. Ral, Crackling Wit provides a resilient, recurring threat and card advantage engine that's hard for their removal-light disruption to answer. Quantum Riddler is too slow against their efficient 1-for-1 removal, and the extra This Town Ain't Big Enough is replaceable since they don't overextend with many permanents worth double-bouncing.