Dimir Midrange brings heavy countermagic (Counterspell, Force of Negation, Spell Snare) and discard (Thoughtseize), so the key is playing around counters and not overcommitting into Fatal Push. Endurance is a strong flash creature here, giving us a blocker against Psychic Frog or Orcish Bowmasters while also being able to strip our own graveyard if they try to punish it, though its main value is just being efficient, hard-to-interact-with body. Our sideboard has little else relevant since they run no artifacts or enchantments. Keep the core intact and focus on resolving threats through their counterspell-heavy shell.