pokemon card mega gardevoir ex · Mega Evolution (MEG) #159 Custom this card is the perfect way to showcase your collection. M Gardevoir-EX | XY—Primal Clash

Also your theory still falls under Scenario 1 in my example, just adding the assumption that rarity cards are released simultaneously, which there is no evidence to support as of yet (I had a lead with Blastoise ad in Oct 96 but went cold)

Obsidian Flames Booster Pack Release: August 11, 2023 Why this set is still so popular: Obsidian Flames is an older set, but it remains popular for one thing: Dark-type Charizard ex

Most of the controversy centered around the fact that the cards were mechanically unique and only available for a limited time (as that is the nature of Secret Lair drops)

Hideaway 5 (When this artifact enters the battlefield, look at the top five cards of your library, exile one face down, then put the rest on the bottom in a random order.)