The community consensus is that in every 15 packs, 10 will contain an uncommon bonus sheet card, four will contain a rare, and one will contain a mythic rare
The damage payoff is much more reliable in this regard than Outpost Siege or Blasting Cannons and much quicker acting than the other Chandra's

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Theres nothing big or flashy, just a bunch of commons that, while mundane, are the backbone of all of Magic
That remains to be seen, but for now, it would seem that - other than one Look at this Family, Julieta Madrigal, and Ariel Singing Mermaid - there's nothing in this deck that will help you build better decks