Not being satisfied with Theorycraft, I took IBA's list into a MTGO Daily Event.

Here's the results:
Round 1 - DDFT (2-1)
Round 2 - TES (1-2)
Round 3 - Mchainmail's Lands (2-0)
Round 4 - Aggro Loam w/ Burning Wish (0-2)

Nothing really that tested the deck for it's special build. I went 50/50 against combo with really fast draws vs their poor draws, and got blown out of the water the other 50%. I beat lands as expected. I lost to Burning Wish -> Devastating Dreams 2 games in a row. :\

One note that I would like to make about GSZ is that is completely ignores Chalice @ 1. This is a really big deal for those games that matter. I also really enjoy using 7 Priest effects because it's very likely possibility that you can untap and cast GSZ for Regal Force, effectively ending the game in 1 or less turns.

I did use a slightly different build than IBA's list. I utilize 16 lands (3 Cradles), and the sideboard contains 3 Cabal Therapy and 3 Thoughtseize (obv vs combo, didn't end up drawing them in my matches however), and 3 Krosan Grip, which I think is a absolutely necessary minimum for this style of deck.

One trick I used against ANT in testing is to board out 1 Heritage Druid, 1 Llanowar Elf, 3 Elvish Archdruid (too slow), and 1 Priest of Titania (ditto). I was able to Wish for elf drops to continue feeding Glimpse triggers, eventually drawing enough Black disruption to Mind Twist my opponent. I'm essentially racing these style of decks to see who will go off faster, except I bring similar disruption that they utilize. Most TES/ANT/DD players don't anticipate this tactic.

I never once felt like I was missing something without Summoner's Pact in the 75. I feel more secure with GSZ being able to tutor them out (and still kind of miss that Glimpse doesn't trigger for them, but oh well).

EDIT: I only used 3 Living Wish however. That never seemed to matter.