Being able to create a 1/1 creature token that can be tapped for green mana can easily help you get more expensive resource-heavy plays off the ground and if you build a ton of these Elves, you can then take full advantage of the third ability to turn your commander into the ultimate draw engine
Its also clear that Bria has garnered a lot of attention from Commander enthusiasts
You can create Clue tokens, Treasure tokens, and/or artifact creature tokens that can be easily sacrificed for vigilance, lifelink, or hexproof
Even if you're not lucky enough to be playing against a token deck, it's incredibly troublesome to track -1/-1 counters on creatures and every player with a creature on the battlefield will have to do so
I probably dont need to explain why discarding cards to draw cards is the best way to take advantage of whenever you discard triggers, but Id argue its so good and central to the plan that you should basically consider whenever you draw effects to belong in the discard archetype as well
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