First, Chapter I lets you choose the most threatening noncreature artifact from each player to turn into a 0/4 Wall artifact creature with defender in the hopes that, once Chapter III comes around, you will destroy all of them (along with any other Walls around)
Interestingly, the above example is not the only combo that you can run with this deck and all of them can be as deadly as this one
While this means that your favorite cards might not be legal in the Standard format anymore, it does keep the meta fresh
The Mechanist, Aerial Artisan Tacking Clues onto every noncreature spell you cast makes The Mechanist, Aerial Artisan some of the most consistent Clue production we've ever seen in the command zone, and mono-blue has the tools to break it
Great Tusk Alternative EX Alternative Art is going for over 35 (around $45 ) as of the set release
I also kind of like the effect here, since a lot of Dimir spells can be really scary if they're copied