With English Pokmon cards becoming harder to afford on the secondary market, Japanese Pokmon cards have become popular among collectors and many of them have made their way to CGC to be authenticated, graded and encapsulated
For the holos and rares, the raw Youtube data from 11 boxes was as follows (the dashed line showing where the transition from H6 to H5 and from R6 to R5 would occur): image396693 10.6 KB image396724 11.3 KB There isnt enough data to say anything definitive about individual card rarities here, but I would not be surprised if all the R5 cards were Trainer cards

Once per turn, "Hane-Kuriboh LV6" can perform a Special Summon from its hand or GY only if an "Elemental HERO" Fusion Monster or "Hane-Kuriboh" in its hand, field Quarter Century Secret Ultra Deck 6.1 7 [5467] JP003 Shining Star Dragon Effect Monster Tuner Monster - 4 Dragon 0 0 The effect of Quarter Century Secret Ultra Deck 8.3 7 [8236] JP004 Xyz Monster Effect Monster - 4 Beast-Warrior 2500 600 (1) (2) (3) Quarter Century Secret Ultra Deck 5.1 7 [6010] JP005 Synchro Monster Pendulum Monster Effect Monster - 12 Dragon 4000 4000 / (1) (1) (2) (3) Quarter Century Secret Ultra Deck 8.5 6 [6084] JP006 Effect Monster - 3 Cyberse 500 500 (1)(2)(3) (1) (2) (3) Quarter Century Secret Ultra Deck 8.8 97 [393074] JP007 Dark Magician Normal Monster - 7 Spellcaster 2500 2100 The ultimate wizard in terms of attack and defense
Since Supporters often define tempo through draw power or strategic effects, removing one can completely shift momentum from turn four onward
They have limited time to play, they want to have fun, and they want to see their deck do its thing