That seems reasonable for the Probes.

Cruise is something I've been wanting to try out, as it's SO powerful. What do suggest I cut?

Swan Song to help protect your combo?

I'm using Pact of Negation in the sideboard because I usually go in one turn.

Bitter Ordeal? all the Myr Retrievers go to the graveyard so you get to exile your opponents library

It costs three mana though. It's a solid choice, but unneeded

if you want more resilience, Myr Superion is a free goyf with summoning.

Leyline of the Void/Surgical Extraction necessary for Emrakul, the Aeons Torn. Bitter Ordeal, as suggested above, is also an alt win con that gets past the Flying Spaghetti Monster.

If you were interested in increasing the speed of the deck (at the cost of weakening it to disruption) you could also run Street Wraith > Duress or Sleight of Hand.

"Millions of Milling Myrs", short "M.o.M.My." I see what you did there. +1 for that.

Hm. Looking at the deck, the only red card left is Faithless Looting. I think you could increase color stability (and reduce shockland pain) by taking it out for a blue or black alternative.

Shouldn't be too hard to find card draw in blue. How about Anticipate or Telling Time? Maybe even Ideas Unbound.

Mystic Speculation, Augury Owl, Index and/or Halimar Depths could give you some cheap digging. The latter two also allow you to target yourself with your Thought Scours safely and dig even faster.

Thanks for the thoughts. I'll take a look and see what I like... you could certainly be right that it is the right choice to cut red.

Isn't Grapeshot just better than Altar? Your opponent can counter altar, but not 5,342,018,893,675,120 copies of Grapeshot?