The shell of Dimir Inverter should look something like the following:
Inverter of Truth x3-4
Thassa’s Oracle x3-4
Jace Wielder of Mysteries x3-4
Thoughtseize x3-4
Thought Erasure x3-4
Narset, Parter of Veils x2-3
Removal spells x6-8 (Fatal Push, Hero’s Downfall, Cast Down, etc.)
Counter spells x3-6 (Mystical Dispute, Cancel, Sinister Sabotage, etc.)
Opt x4
Dig Through Time x2-3