Fucking nonsense Ikoria. This deck wants to go in two directions.

Direction one Jengatha as a companion, Fires of Invention/Kinnan/Golos/Niv-Mizzet reborn. We also resumably filled our deck with two colored creature bombs and ramp. In this direction We spew our deck into play. Jengatha Casts Niv, makes ten mana with Kinnan, and can't be used for generic, but can be used for sctivated abilities, like Kinnan and Golos. Like the three of them in play means for 4 generic mana you activate Golos twice. Kinnan's activation can be used with Fires.  Ramp can either be putting more land into play via growth spiral or cycling explosive vegetation, or the crystals that double with Kinnan and become super worn powerstones. Cycling is great with Fires. Let's call this the heavy Kinnan route.

The second route is the heavy Golos route. Here we don't have Jengartha probably as our companion, but we get to hit a bunch ultimatum's. Genesis ultimatum's chain with new copies of fires I believe. Perhaps this is a better wilderness reclamation/teferi, time reveler deck.

This five color monstrosity, in one form or another, is a serious contender if I have to play standard.