Because Lutri was banned for reasons not really related to power he bypassed the gamechangers list, where unbanned cards typically go
This allows older printed versions of these same cards to be used in newer rotations
Each Play booster contains 14 cards, including 1-4 cards of rarity rate or higher, 3-6 uncommon, 6-9 common cards and 1 land card
The result of this interaction was previously unintuitive to many players: since that Saga had no chapter abilities, the game defined the "greatest number among its chapter abilities" as zero, and no matter how many lore counters that Saga had on it, it would be sacrificed as a state-based action once it wasn't the source of a chapter ability on the stack (usually right away)
Thats where Time Sieve comes in
That means as long as you keep him ready, it is very hard for them to remove him