To take this list further you gotta start cutting the Go Wide / Go Tall stuff like Kessig Cagebreakers and instead focus on tutors to speed up your combo (Demonic Tutor) and ways to protect your combo (Dosan, the Falling Leaf)
Team Avatar Team Avatar is a flexible card that shows off white's way to burn creatures down, and that's with it's strength in numbers
Until end of turn, you may cast those cards without paying their mana costs.
HANDISNOTFULL Created By: DIASILEDU HANDISNOTFULL gives players full control over the number of cards they can hold in their hands
As for some helpful advice on the matter: Spellbook Star Hall -3 Grandspell book Tower -2 Royal Magical Library + 1 Magical Citadel + 3[With Library Maxxed out, and a constant usage of spells, it can fuel Library for a long time if drawn early game.] Terraforming + 2 [Searching, and can add fuel to the fire] Hand Destruction + 2/3 [To get rid of those extra's, like Citadel or Terraforming.] If i gave anymore suggestions, i'm sure it wouldn't even turn into a spellbook Exo Deck anymore in your eyes, so i'll leave with those
