How...

First of all, put Snapcaster Mage back in, he's godlike, especially in a deck with so many instants and sorceries.

Leyline of Anticipation and Vedalken Orrery are fantastic.

Also, you want all the extra turn funstuff: Beacon of Tomorrows, Time Warp, Time Stretch, Temporal Manipulation, Capture of Jingzhou. Well, those are all nice and wonderful, but I think we want to put them exactly where we want them correct? Personal Tutor and Mystical Tutor. Add an Enlightened Tutor while you're at it (Do you like Omniscience, because I like Omniscience).

Replace Ugin with Karn Liberated. They serve an extremely similar purpose, and Karn does it WAY better.

Brainstorm is AWESOME in narset decks. Do you not see? Respond to her triggered ability, put two super expensive cards on top of your library, voila. To that extent, Jace, the Mind Sculptor should be replacing your other jace, because his +0 ability is also amazing in narset. Long-Term Plans is basically an insta-win if you have one of the godly enchantments or sorceries.

Crazy good game-winners: Eldrazi Conscription, Blatant Thievery, Omniscience, Enter the Infinite

Something fun to think about is take out all the creatures in your deck except for Narset, then add a dash of Proteus Staff Shake and Shuffle to your liking, then attack and win the game.

Reconnaissance is basically a must, and if you like that card then Legion's Initiative has a similar, albeit one-timer effect.

While this isn't incredibly common in Narset decks, Godsend is a gigantic middle finger to anyone who wants to block you.

Narset is so awesome with that hexproof, it's great.

Cheers, hope this helps, ~Fugu

To HonoraryFugu and Quicksilver,

First of all, thank you for stopping by and leaving a comment. I truly value the input of other players.

I play in a very control based meta where Narset rarely makes the battlefield, let alone swing. I mean, this can be remedied by getting a Cavern of Souls, which I currently don't have. Time Walk effects are cute and powerful if Narset is on the field. However, like I said before, these effects feel basically useless when she isn't there or they are in my hand. I've debated about adding one more Time Walk though. Same goes with Proteus Staff, it doesn't really do much without Narset. Furthermore, these things put even more of a target on my head (I mean, most players are already gunning for me for just playing Narset). I'm not a fan of cards that are completely dependent on my commander being up, running, and uncontested. I mainly have this opinion because we have another Narset player that runs the typically build, with time walks, expensive cards ( Storm Herd, Omniscience, Enter the Infinite, etc), and the works. Generally, he sits there and doesn't get to play because he is constantly disrupted. I rather be controlling the field and using my few, yet efficient creatures to bait counterspells, removal, or boardwipes. Grand Arbiter Augustin IV, however, is constantly on the chopping block though. He is so good in a few spots, but meh most of the time.

However, I agree with some of your suggestions. I should put Snapcaster Mage back in. I was just being cheap and using it somewhere else. Ugin is easier to get but, it should just be Karn Liberated. Brainstorm is a good Magic card. I just don't know what to replace it with to be honest. Jace, the Mind Sculptor isn't in because I don't have one. When I acquire one, it's definitely going in. I'll have to try Blatant Thievery, Godsend, and one of the Flash enablers. Once again, thank you for the comments.