Hey, the big takeaway of this prerelease for me was that mulligans are still not fun! I had 8 straight sevens with only one land (I was playing 17 in a 40 card deck), mulliganing to 5 in the deciding game 3 of the 2nd round, and in both games in my 3rd round 0-2 loss, and mulliganing to 6 in the first two games of my round 4 match. Round 3 was especially brutal, as my opponent dropped a t2
Yarok's Fenlurker in game 1 (remember, I already mulliganed to 5), and a t1
Duress (that hit a cantrip) a t2 Fenlurker (again!) on my other mulligan to 5. Yeah... Fun times!
I have an unwritten rule I follow at the prerelease, though. Whenever I start with a 1-2 record, I completely rebuild my deck with other colors if at all possible, to at least have a different experience in the last three rounds (we always play six rounds)! This time I switched from a


deck featuring
Rotting Regisaur (stoopid card) and
Dread Presence (fun!) to a


deck splashing

for
Kykar, Wind's Fury, as pretty much my only "bomb". I had less removal, but more early game and a lot of evasion, which worked surprisingly well. Also,
Aether Gust is a disgusting sideboard card, and I probably should have mained it, considering how many players were playing red and/or green in their decks. Kykar is awesome, and almost enough to make me want to reintroduce Jeskai as a shard in my cube! Super fun build around!
So, with my chin up (I'm here to have fun, not to sulk about unlucky openers!) and a new deck to pilot, I was able to win game 2 in round 4 despite the mulligan, and I managed to clinch game 3 as well, eventually ending up with a 3-3 record.
Oh yeah, the most fun game was in round 5, where I got to go off with
Golos, Tireless Pilgrim. My fixing was horrible, so I couldn't affor to run a Forest in my three color deck, but I played a single copy of both
Dismal Backwater (for

) and
Prismite (for

), and it was glorious! I hadn't been running any five color cards in my cube up until now, but Golos is a marvelous build around, and super satisfying to pilot! I'm definitely making room for him!
All in all a satisfying experience despite the bad luck streak in the middle there. Set looks fun, but I did notice there is
a lot of chaff. The cool cards are amazing to play with, but you really have to stretch for playables in Sealed in this format. I asked around a bit, and this was pretty much the case for almost everyone. I suspect WotC's main trick to make this a three color format was to not include enough monocolored playables in each color to end up with a decent two color deck (
he said, only half jesting)...
Edit: Some cards I really enjoyed playing:




Ancestral Blade did some work, providing early pressure, as well as making sure my creatures were just enough bigger to get in attacks, while leaving behind a chump blocker. A+
Audacious Thief was really fun in my deck with multiple pump spells. Basically Kirblinx was spot on with their assessment. Card drew a bunch of card while clearing out bigger blockers with the aid of some pump spells. Loved it!
Dread Presence was great at getting in for value. The best showing it had was when I was playing a deck full of annoying dorks, where it just kept shooting stuff. I also made a great uptrade when I played it after attacking with my Audacious Thief into a 4/4 blocker (still drawing a card), then dropped the Presence and a Swamp to deal the final 2 and gain some life back.
Kykar and Golos I already talked about, they're simply very fun build arounds without being overpowered.