Version 0: Timur and Lumia (no record)
(Friend's only EDH deck. Wasn't great, and owner unhappy with it.)

Version 1: It was updated to Mizzex by another friend using available cards (plus Mizzex).
(Diagnosed: lack of direction, slow, cards too restrictive&/hard to play for player level)

Version 2: Later 21 card changes were made by myself.
(Deck was unsleeved and found to be at 101 cards afterward. Cut a land (Island in v2/transguild promonade v1) as was likely the extra in the first.)

Version 3: Massive 41 card change infusing new cards, also by me.

4th iteration is going to be 5-12 cards, without land upgrades
Ghitu Fire-> Jaya's Immolating Inferno
Disintegrate -> Red Sun's Zenith
Arc Blade-> Beacon of Destruction #Recurs slower, but a better card overall, Maybe.
Convolute-> Supreme Will
Dismiss-> Insidious Will #Better, loses draw.

Niv-Mizzet, the Firemind -> Fire Servant #Niv or Deluvian Primordial - primoridal casts spells, Niv doesn't.

Mystic Retrevial -> Time Reversal

Unwilling Recruit -> Aftershock

Grab the Reins -> Cindercloud

Word of Seizing -> Fissure

Bulduvian Rage -> Lavaflow

Curse of Swine -> Commit // Memory #commit cmc4, Memory cmc6

Swarm Intellegence. It's the only Enchant. Frozen aether might have been better. Or a rock/ramp.

More Iterations unlikely outside of finishing previously noted changes; more likely to completely rebuild.