Each of these comes from one of the five Lorcana sets that have come out since the game's release
As a brief mathematical aside (feel free to check my work, Quandrix nerds), here is a short comparison of non-generic/staple overlaps with the appropriate predecessor across each Secrets of Strixhaven Commander deck, not counting Sol Ring or Arcane Signet nor generic/staple lands: 7 cards from Silverquill Influence overlap with Silverquill Statement 10 cards in Witherbloom Pestilence to Witherbloom Witchcraft 10 cards in Prismari Artistry to Prismari Performance 5 cards in Lorehold Spirit to Lorehold Legacies 9 cards in Quandrix Unlimited to Quantum Quandrix Seeing the data laid out as such, it's hard to justify my vibes-based analysis as anything more than a poorly calibrated vibes antenna
When there are nine or more incarnation counters on this enchantment, exile it
If a character takes damage equal to or greater than its Willpower, it is banished to the owner's discard pile
Or are they holding it up
They had a similar amount of cards as the Play Boosters, but these packs contained much wider ranges of rarity, boasting a maximum amount of four Mythic Rare cards per pack