I drafted a lot of 3xTHS lately but I had never tried sealed so yesterday, I was looking for something different and tried a sealed. I joined without any expectations but I didn't want to go 0-3 which I did. I don't think my pool was really bad but maybe I built it wrong. Any opinions would be extremely valuable.
I can't really see anything that stands out as a stronger alternative to the GW deck you built. You might be able to tweak your original build somewhat; Pheres Band Centaurs vs an 18th land, for instance, but you have the Caryatid so it might not be necessary.
Maybe splash for Sea God's Revenge? That card is pretty nuts. Maybe drop Fade from Antiquity for SGR, drop Centaurs for the Unicorn? Nah, you're deck is pretty focused, and there's not really a compelling reason to screw with the mana consistency. I'd consider siding in the Revenge if my opponent was a slower monstrosity-style deck, maybe.
In the future, it helps a lot to segregate your cards by color. It makes evaluating the pool easier and you'll get more constructive input that way.
I think Sea God's Revenge might have been ok. I considered blue and red for a very long time due to Thassa and Stormbreath. Glad I made the right choice, but that must mean that I played really bad then.
I would probably have played W/U. It's a stronger archetype, has plenty of playables in blue plus Thassa. The main strength of your pool is the heroic creatures, so cards like Aqueous Form are actually fine, and you get a second Ordeal to cheese some more wins.
I also would have played Evangel of Heliod. It's a pretty good card, especially in sealed where matches devolve into long slugging fests more easily. You even have a good amount of white devotion for it, and a Phalanx Leader for the wombo combo. It's certainly better than Pheres Band Centaurs.
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Draft my 360 Cube, it has Storm! Everyone likes storm.