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If The Darkness Crystal leaves the battlefield at the same time as one or more nontoken creatures an opponent controls would die, those creature cards will be exiled and you'll gain 2 life for each of them

While this is already a significant jump, prices quickly increase beyond this point, so this spike might not be done yet

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The main problem is that this card does not grant any additional, passive lore, which I think is the strongest pull of the Location cards in general

And that's before we even touch on the potential of scalping and price gouging issues that, judging by the rate at which MTG Final Fantasy's pre-orders sold out, players should be vigilant about