Some cards give you energy counters, usually on resolution, but some cards add energy during other phases as a static ability, attack triggers, damage triggers, and activated abilities
This release was first teased back during the fresh hype of the Lord of the Rings crossover set

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Furthermore, Im leaning towards Abrade in the board over Brazen Borrower
Beyond that, it provides some stable card advantage at affordable increments, which can be crucial in smoothing out your draw (as Foundations lacks many other cards for this purpose)
But if you're dropping enough land, you could be Proliferating four or five times a turn, and that's valuable