What it does
I'm not aware of "Those Who Came Before" as an official Magic: The Gathering keyword or ability. It doesn't correspond to any printed mechanic I can reliably describe, and inventing rules for it would risk giving you incorrect information.
It's possible this is a custom or unofficial card, a flavor phrase from a specific card's name or text, or a misremembered version of an actual mechanic. For example, you might be thinking of something like "Undergrowth," "Threshold," or a graveyard-matters ability, but I can't be sure.
If you can share the exact card name or reminder text, I'll gladly break down what it does, the common rules pitfalls, and how it plays out in Commander. Accuracy matters more here than guessing.
Iconic cards with Those Who Came Before
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