Deck Tech: Uses ramp spells like Growth Spiral and Uro, Titan to cast Casutalties of War, Nissa, Who, Elspeth Conquers Death and of course Hydroid Krasis. The deck also utilizes Yorion, Sky not only to have a flicker effect for Elspeth Conquers Death and Omen of the Sea, but also to expand the number of cards we're running maindeck to run a high number of powerful cards. Mythos of Nethroi and Casualties of War are the main reasons why we're splashing for black. The Triomes are also great because they allow us to make use of the secondary function of Mythos of Nethroi and to cycle lategame if we get flooded on lands. 

Sideboard Tech: We dedicate most of our sideboard to Yorion Jeskai(well, Yorion lists in general), and a bit toward Cycle. Unmoored Ego blows out Jeskai Yorion because you exile all of their Agent of Treachery, and then they struggle to find another way to win since it's sort of an all in stratagy. Unmoored Ego also preforms decently against Cycle lists because you can just exile all copies of Zenith Flare. This is a bit risky because some of the blue lists will run counter magic(namely Mystical Dispute), but I still think it's worth the sideboard slots. Thought Distortion also helps us against Yorion lists because we exile all the counter magic and Elspeth Conquers Deaths, and ECD targets. Knight of Autumn is mainly here for Sacdos and Mono Red(yes, some people still run this). It's also decent against Wilderness Reclamation. 

Temur Reclamation:

-1 Omen of the Sea

-1 Uro, Titan

-1 Elspeth Conquers Death

-1 Shark Typhoon

-1 Casualties of War

+2 Despark

+3 Dovin's Veto

Jeskai Fires:

-1 Omen of the Sea

-1 Uro, Titan

-1 Tamiyo, Collector

-1 Shark Typhoon

-1 Hydroid Krasis

Dovin's Vetos are worth considering, but they're dead the moment the opponent lands a Teferi, Time Raveler. I dislike having dead cards in this match up because it's so high tempo and swingy in the Jeskai Fires's favor. The reason why I like Veto here is because it stops Elspeth Conquers Death. 

+2 Despark

+3 Knight of Autumn

Yorion Jeskai:

-1 Shark Typhoon

-1 Hydroid Krasis

-2 Omen of the Sea

-2 Uro, Titan

-3 Shatter the Sky

+2 Despark

+2 Thought Distortion

+3 Unmoored Ego

+2 Dovin's Veto

Sacdos(Obosh, the Preypiercer):

-1 Elspeth Conquers Death

-1 Omen of the Sea

-4 Thought Erasure

Not sure if it's correct to remove Thought Erasure or if it's correct to bring in Dovin's Veto. Veto protects us from Act of Treason, and Thought Erasure COULD grab a Mayhem Devil. Veto could also sit in our hand all game while we need something more proactive, and Thought Erasure could be top decked while our opponent has 0 cards in hand. Pros and cons on both sides, so I'll have to give this some more thought before locking anything in. 

+1 Tolsimir, Friend

+2 Dovin's Veto

+3 Knight of Autumn

Jeskai Cycle:

+2 Dovin's Veto

+3 Knight of Autumn

+3 Unmoored Ego

Hit Zenith Flare with Unmoored Ego while the opponent is mostly tapped out, or after devloping Teferi, Time Raveler. After this, simply control the board and the game is yours. Gain as much life as you can so that Drannith Stinger can't steal the game from you. The Knight of Autumns are for Unbreakable Alliance and life gain so you don't get burned out by Drannith Stinger, and could potentially save you from an early Zenith Flare finish. 

-1 Omen of the Sea

-1 Casualties of War

-1 Uro, Titan

-1 Tamiyo, Collector

-4 Elspeth Conquers Death