WotC says each one is sold out at the Secret Lair storefront
The natural endpoint was Auras, but there are only so many of those you can put in a set
I think this is a bit of an outdated hangup though
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While he couldn't speak to that last point, Fleischer says we could see more precons with editions like this in the future, but that the audiences response will determine whether Collectors Editions become a mere experimental data point for Wizards of the Coast, or the new business-as-usual." You can watch our unboxing in the video above, and read on for the full interview
By contrast, the Passionate Archeologist Background has is a powerful burn effect that stays active while Durnan is on the field and can really make the opponent suffer, which Durnan's cheap exile summon can take full advantage of