Izzet Control featuring Goldspan Dragon has been a Standard staple for a while now. Having that burst of mana specifically give you two mana on the turn you cast Goldspan Dragon means you're guaranteed two mana from it attacking or it being targeted by an opposing removal spell. In either case, you will be able to stifle your opponent's interaction or development on the following turn with some manner of counterspell or removal.
With the release of Innistrad: Midnight Hunt, a lot of powerful stuff rotated and has left room for new decks and archetypes to show up. I've been experimenting with a few different builds of Izzet in the hopes that something would stick. Wyatt Darby played a cool "Turns Combo" involving this little pair, and I thought it was worth a try.
This build was pretty cool, allowing you to take four or more turns in a row sometimes, making Birds all the while. There were a few too many spots where Galvanic Iteration didn't quite do enough, and more points still where I would cast Alrund's Epiphany, sometimes multiples, and lose. Time Walk effects are strengthened by cards already on the battlefield. If you cast a Time Walk without pressure or some way to gain a micro-advantage, what are you actually gaining? Some mana from the rest of the lands after you've cast the Time Warp? In essence, Alrund's Epiphany can be lackluster if you don't pair it with permanents that gain micro-advantages. That's why I moved on.