You can do a lot better with the auras you have for Narset.

Battle Mastery is a cheap one that gives double strike to her.

Steel of the Godhead gives her a +2/+2 boost as well as making her unblockable with lifelink.

Eldrazi Conscription will just decimate people if you free cast it with Narset.

Aqueous Form gives her unblockable and lets you scry.

All That Glitters Sage's Reverie and Ethereal Armor will give her a massive boost.

On Serra's Wings can give her a bunch of keyword abilities and a boost.

Corrupted Conscience you can put on Narset for infect wins or use it to steal a good creature.

Scourge of the Nobilis gives +2/+2 , lifelink , and a way to drain extra mana during combat to go for a kill.

Response / Resurgence is another extra combat spell you could use in the deck.

Smoke

The main area that will improve this deck the most is your mana ramp. I'll try to keep my suggestions budget friendly and I can also help suggest some cuts if you'd like.

Talisman of Conviction, Talisman of Creativity, Talisman of Progress, Fellwar Stone, Pentad Prism (only cost rock that ramps 2 different colored mana in one turn), Worn Powerstone, Coalition Relic, and Basalt Monolith are all great mana rocks here. Crystal Vein and Generator Servant are great options too. I literally ran all of these plus what you already run.

Feel free to check out my list for ideas. It's extra turns Narset and it's pretty optimized. Upvotes on any of my decks are appreciated. Narset, American Beauty

Aggravated Assault allows us subsequent attack steps and therefore triggers. If we make enough colored mana we can play out our entire deck. Truly enchanting. :)

Aggravated Assault + Sword of Feast and Famine goes infinite with 5 lands also.

Last_Laugh, i like the cut of your jib!

Thanks for the suggestions! What should I take out for Aggravated Assault?

You're not running Mystic Remora or Rhystic Study ?

Nice deck overall.

I am running Rhystic Study! I could give Mystic Remora a try.