Extra mana and potentially extra cards add up very quickly, enough that decks try to pack in extra answers to it
This card was definitely built with the RLS Legacy in mind, which makes sense as its the ship he inhabits in Treasure Planet
Warrior is a well-supported type in Commander, so there are possibilities for the card there, but this isnt coming anywhere near Standard unless something massive changes soon
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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)
Whatever the reason for the current interest in this and similar cards, theres not enough supply to absorb the demand