You don't want to search for and put Skullclamp or Ashnod's Altar out at instant speed??

Probably cut Recurring Insight. Trust me whir has won me so many games for just 4 or 5 mana. Getting your Isochron Scepter or Skullclamp out before your untap is extremely powerful.

Whir being flexible as to hit any target makes it very good, from experience. It can get Sol Ring and other cheap ramp (moxes/vault/crypt), improvise from resolved non-mana artifacts, and puts pieces into play unlike Fabricate. Comparing it to Fabricate, it is more cost restricted which might be the biggest issue and requires you to have the mana up-front rather than split across two turns. I've often treated Whir as another Trophy Mage to get Altar.

CrimsonKing: Fair enough. Recurring Insight has always proven itself in my meta, but I’ve been considering cutting Murder of Crows for a while. Might go in that slot, or perhaps Hurkyl's Recall?

Murder of Crows seems like a good cut. Yeah meta means everything anf the recall is good for stopping a lot of things.

My list looks like yours mostly besides my dual land and Impact Tremors/ Purphoros, God of the Forge. I mostly use those because of Propaganda effects can be heavy in my meta sometimes and having a way to win without attacking is vital. Have you tried the new niv yet? Haven't gotten around to using him yet.

CrimsonKing: I just found that he wasn't helpful because if I'd drawn 20 cards with Locust God out, I already was gonna win (through an infinite combo or what-have-you, not necessarily combat). After 50+ games of drawing him but never casting him, I just cut him to use the slot for something else. But if he works for you, more power to you!

This list is insane! Primer looks great too! Looks like you've put a lot of work in, it really shows, may your draw be plentiful.

Just curious, what do you usually tutor for with Muddle the Mixture and Spellseeker? Isochron Scepter for Muddle?

usaDiabetic: Thanks man! :D It's pretty sweet, haha.

Pinacollata: Honestly, the two tutor for many of the same cards: Dramatic Reversal if going for Dramatic Scepter, Transmute Artifact if going for a Paradox Engine loop, Cyclonic Rift if needing answers in the late-game, Mana Drain if looking for protection, Mission Briefing if you need recursion.

However, Muddle the Mixture can also grab Isochron Scepter directly, as well as mana rocks for various loops. Meanwhile, Spellseeker can also grab Pact of Negation for manaless protection, Winds of Change to create Locusts or mess up hand sculpting, or Mystic Speculation if I already have Paradox Engine on the battlefield.