The game plan - Control the board until you gain access to your top-end cards.

The mix of 2-of's gives this deck its versatility to manage early to late-game situations. This is especially good with Narset and Omen of the Sea mainboard giving you the ability to dig in your deck for the cards you need.

Early game: (always try to have at least one of these in your opening hand in a 1st game scenario or Bo1)

Omen + Birth of Meletis + Glass Casket + Fae of Wishes + 3feri + Narset

Mid game:

Shatter the Sky + Thassa's Intervention + Cycling Shark + 4feri + Fae of Wishes (Granted)

End game: 

Eugene + Cavalier/ECD chain + Shark Typhoon/Interventions

Special Mentions:

Heliod's Intervention to live through lethal from beatdowns, or destroy key enchantments/artifacts like Stonecoil Serpent, Doom Foretold, ECDs, and Ovens.

The Cavalier of Dawn is really good in this deck as it gives you some sort of an all-around answer to your opponent's board. It can cut off those pesky ovens, snipe down a Stonecoil (can't be touched by 3feri and ECD), or a Nissa threatening to hit her ultimate. Having 2 of these instead of 4 ECDs mainboard makes a lot of difference. The 2 Cavs + 2 ECDs combination seems to hit the right spot for that sweet sweet end-game cycling between the two. The Cavaliers also make better use of the chilling omens on board for aggro match-ups compared to chucking in a Yorion. The 3/3 Golem can really matter when you're up against the likes of mono-red and when you or your opponent threaten to 'minus' a Eugene.

Sideboard Game Plan:

Take out Fae of Wishes from the mainboard if you need more space for adjustment cards. The Faes are there to give you access to the sideboard in those game 1 situations. So post boarding, just get those cards in your mainboard straight away and skip the 4cmc sorcery part.

vs. Aggro

In --> Glass Casket + Heliod's Intervention + Time Wipe

Out --> Eugene + Thassa's Intevention x2

vs. Control/Ramp/Flash

On the Play

In --> Mystical Dispute x4 + Narset + ECD x2 + Soul-Guide Lantern + Sorcerous Spyglass x2 + Eugene

Out --> Fae of Wishes x2 + Shatter the Sky x3 + Heliod's Intervention x2 + 4feri x4

On the Draw

In --> Mystical Dispute x4 + Narset + ECD x2 + Soul-Guide Lantern + Sorcerous Spyglass x2 + Eugene + Glass Casket

Out --> Fae of Wishes x2 + Glass Casket x2 + Shatter the Sky x2 + Thassa's Intervention x2 + 4feri x4

vs. Sacrifice

In --> Grafdigger's Cage + Soul-Guide Lantern + Sorcerous Spyglass x2 + Heliod's Intervention

Out --> Thassa's Intervention x2 + Fae of Wishes x2 + ECD x1

Still testing it out in both Bo1 and Bo3 game modes. Leave a comment below and let me know what you think. Cheers!