Thunderous Orator is a secret "flyers" card, with some rare but fun upside beyond that and a reasonable floor even if you can't find triggers. Might be too narrow outside that deck however.
Curate seems like the best version of the 2-mana instant cantrips if you're looking to support blue graveyard decks.
Frost Trickster is just incredibly strong and looks to be one of our first staples from the set.
Emergent Sequence I think is a really neat design and, as stated, compares pretty closely to Servant of the Conduit. Bonus +1/+1 counter synergies should give this a slight edge for cubes which support that.
Symmetry Master I'm surprised isn't getting more attention, but this is effectively a 4-mana 4/4 reach, trample which is a statline we've never seen before and is just incredible on offense and on defense. Not to mention the incidental triggers you can pick up on your other creatures (Beanstalk Giant anyone?), I have this tagged as the other Peasant staple so far.
Letter of Acceptance trades the repeatability of Bonder's Ornament for a much cheaper one-time activation, not sure which ends up being better on average.
Lots of spicy gold cards with some new effects that are going to be difficult to evaluate. A few standouts so far look to be:
Zimone, Quandrix Prodigy
Really excited to see what