Invasion of Amonkhet Krydle of Baldur's Gate Phenax, God of Deception Oona, Queen of the Fae Mind Grind Soaring Thought-Thief Glimpse the Unthinkable Duskmantle Guildmage Umbris, Fear Manifest Ashiok, Dream Render Traumatize Lands Dimir wants a lot of lands that produce black and blue mana , and there are lots of those to choose from
Budget Accordingly: Cards in slightly lower conditions (e.g., Lightly Played) are often more affordable without compromising playability
Upgrading Exit in Exile Exit in Exile is a fairly well thought out deck
What I can determine, though, is that the payoff for transforming this card is very good, and it is specifically this transformed effect which is more synergistic to blue builds
Veloci-RAMP-tors game plan may be less new and exciting than something like Blood Rites, but it is reliable and powerful as a tradeoff