Barrets attack trigger is fine, but its little more than a nice bonus that can come up every so often
Steels damage abilities make the banish choice highly valuable against Tamatoa and Mufasa in Sapphire, tricky Evasive or Bodyguard characters, or anything you just need gone
We can hit a Craterhoof, we can hit a Lord and even if we hit a less-than-stellar creature, it gets to come in with three +1/+1 counters, making it a threat by itself
If Esper or Dimir Control is a deck I think you'll just be including this card, even if it's just one copy in your maindeck
(2025-06-06) Once the number of lore counters on a Saga is greater than or equal to the greatest number among its chapter abilities, the Saga's controller sacrifices it as soon as its chapter ability has left the stack, most likely by resolving or being countered