Ready-to-play starter decks contain a preconstructed deck with a specific c
A reprint from the shock lands like Watery Grave and Steam Vents affects Pioneer, Modern, EDH, in terms of card availability, but it wont change an established metagame because the card was already legal there
Upgrading Exit in Exile Exit in Exile is a fairly well thought out deck
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
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