To help steal some kids from yugioh, the whole "ooh look mommy, I just opened a secre... I mean mythic rare!".
Well, they failed to understand Yu-Gi-Oh! What makes pulling a Secret Rare awesome was that 1) it was foil is a special way and 2) you could get a lot of cards for it because it was probably strong. If the card sucked, you swore as much as if you pulled a lace or a junk rare. In MtG, they had that as well. You can get a lot for good rare cards.
I read their explanation but it just does not make sense to me.
I am guessing you are talking about something a bit more obscure than D&D
Most of the games he listed still exist but, like D&D, are totally different games than their first version.