Garruk, Cursed Huntsman, aka basically Elspeth, Suns Champion
While the majority of the expansion is a mix of collectibles from the Japanese Incandescent Arcana and Paradigm Trigger sets, the final Sword and Shield collection also has a massive Trainer Gallery subset that features unreleased cards from 2021
If you can expect triple red at any point then Devil's Play is likely the best of the bunch although there is a surprising amount of merit to the uncounterable Banefire/Demonfire options
Zapdos can deal 170 for one single Fighting energy, which is more than enough to take Eternatus VMAX down in one hit
What roles a Flash creature is able to play depends on the size and mana efficiency of creatures within the format
Thats a good thing too, because theres enough mana-fixing in the set to allow players to comfortably build three-colour draft decks - although sticking to two colours will obviously make for a more consistent deck