Twist on classic tezzerator/thopter foundry. Disciple of the Vault makes the combo exceedingly lethal for your opponent, as it will drain your opponent each time the sword hits the yard. It gets better with Time Sieve, as the sacrificed thopter tokens do technically enter the graveyard before disappearing, which also triggers our friend. This means that you will win in two turns, as every time you make five thopters and sac them to the sieve you will be hitting your opponent for 10. The fact that this ignores prison effects like Ensnaring Bridge is just gravy. We also have some fun things to tutor up with Whir of Invention; tutoring up Welding Jar, Orbs of Warding, or Pithing Needle essentially counters many spells. Orbs is especially nasty against token decks or decks that need to target you to win. We can also tutor up Cranial Plating to pretend we're affinity; if they let one thopter through you can surprise hit them for 10+ pretty easily. That's just one of our backup win cons; that doesn't even take into account the insanity that is Tezzeret, Agent of Bolas on a board full of artifacts. We can also play him on turn 3, which is fun, though often not strictly necessary. Herald of Anguish is a house; it's Gurmag angler-like in its ability to come in for cheap in the mid-game, and the fact that its discard trigger happens on your end step means it will almost immediately begin to disrupt our opponent. It's also an evasive 5/5 with built-in removal that can get around indestructible creatures, which I hear is pretty good. Ensoul Artifact gives us some early board presence and is a good distraction from our actual threat of the combo. It can also just pick up free wins when the opponent can't meaningfully interact with a 5/5 flier (especially if its an indestructible Darksteel Citadel. Steel Overseer is another thing we can tutor up on our opponent's end step and represents yet another path to victory via thopter beats. as in affinity, it forces your opponent to deal with it or essentially concede.

River of Tears is the most beautiful land in the game and should be forced in every Dimir deck. I refuse to back down from this totally reasonable position.

Since Whir of Invention gives us such a sideboard friendly ability to tutor up toolbox-type cards, we can have fun in the sideboard. Nihil Spellbomb wrecks graveyards and draws us a card, as would Relic of Progenitus. a second (or third, you do you) Pithing Needle gives us resilience against planeswalkers and other such shenanigans. Mana Leak is a fine all-rounder that plugs multiple gaps, and Duress does its thing as always. If you want more removal, this is the deck Battle at the Bridge dreams of being in. It pads our life and can take out surprisingly large threats. Damping Sphere is probably also a shoe-in as a gotcha against Tron and Storm. Trading Post is excellent in grindy matchups; it generates a lot of value over a long game and can give you the edge to win.

Be careful not to dilute your artifact count, though, or the improvise cards will get markedly worse. Having twenty mainboard artifacts also gives us an 80% hit rate on Glint-nest cranes, and taking out too many dilutes our deck to the point of near-unplayability. We need them to hit to make our combo consistent, as with the cranes and our favorite planeswalker (and whir of invention as a backup) we can pretty easily get the combo online by turn four/five or so (though earlier is better).

I realize my mana base is greedy, though Pentad Prism and the abundance of improvise smooths that out somewhat. Feel free to alter as you wish, though keep in the mind the specific cards you are playing so as not to hose yourself too badly. Twenty two lands is probably ideal here (don't skimp on the blue sources). I am likely going to cut a Darksteel Citadel for another River of Tears simply to improve the mana.

One cute interaction I considered was using Noxious Gearhulk as a tutorable removal spell that gains us life, but x=6 on Whir is a little too magic-christmas-land-y for my taste. YMMV, though, and I guarantee no one will see it coming.