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They seemed dubious to me from the first time I read a preview via Mark Rosewater

Chart shows the price of Hau #20/SM-P at the end of each month going back as long as we have tracked the item.

And in Black with the Cabal Coffers/Urborg combo you can make tons of mana, and this color combo is rich in card drawing for spells like Ancient Craving and Sign in Blood as well as removal like Bedevil and Chaos Warp to have enough for making the 3/3

Stores selling out of Pokemon TCG cards resulted in the manufacturer upping the production numbers to make sure fans were able to have access to the packs they want

The fallout from that banlist change is covered in the OP-15 meta tier list article linked below

Collector Booster Rarity Breakdown: Related Products