You also don't have to sacrifice things to him that make no sense, like lands or artifacts
Undergrowthy Stuff Izoni has undergrowth so we have incentives to lean hard into cards with actual undergrowth, like Hatchery Spider and Kraul Harpooner, and other cards that care about how many creatures are in graveyards
As for Exalted Sunborn itself, the Warp ability gives you a 2-mana temporary version you can cast again later for full value
It's not an instant staple and shouldn't make much of an impact today, but the original mana dork is a good addition to the Metagame and could find more space as the format develops
This deck is crazily synergistic and well-rounded despite the insane theme and price point
Granted, Reanimator strategies are very firmly in my wheelhouse, so in many ways, the deck is also extremely forgiving for someone who isnt well-versed in aggressive strategies