It is a ladder: contest promos at the top, anniversary cards in the middle, modern AR/SAR cards for active collectors, and budget cards for entry buyers
Together, these two cards form a formidable core that can win games even when behind
This means future "Trainer Galleries" can be padded with other cards, further making them a "set within a set." The Character Rares are in the reverse holo slot of the booster pack, meaning you can still pull a rare card like normal (such as a holo, VSTAR, rainbow rare, and whatnot)
This phrasing is likely in order to specifically exclude cards that incidentally include in their Japanese names, such as "Clock Spartoi", as well as "Toy" spells unrelated to Yugi's deck
5.0 5.1 5.2 5.3 Tewart, Kevin (June 1, 2011)