pokemon terastal festival booster box - japanese Pokémon TCG: Scarlet & Violet: Catch the crystalline chaos of Terastal Festival ex Pokémon Scarlet & Violet -

So here's probably the best fan theory on the origin of the Hidden Fun Stuff

Next section: "To determine which replacement effects apply and how they apply, check the characteristics of the permanent as it would exist on the battlefield, taking into account replacement effects that have already modified how it enters the battlefield, continuous effects from the permanent's own static abilities that would apply to it once it's on the battlefield, and continuous effects that already exist and would apply to the permanent." This is the "lookahead" referred to earlier

Graded Population Report: Pikachu #1 Visualize the distrbution of grades in the chart

This ability doesn't need you to tap, allowing you to activate it multiple times a turn, and at instant speed

After the closure of TCG Online in 2023, it was replaced with Pokmon Trading Card Game Live (PC) and Pokmon Trading Card Game Pocket (mobile) in 2024

I Skimmed the titles and didnt read the content except for the Meiji cards which only caught my eye because you missed the original 1997 Promo set