A pokemon card display case designed for slabs keeps the holder protected from dust and handling, which matters for any high-grade Mewtwo Pokmon card you plan to keep long-term
Sometimes, smallformat runs are a touch pricier due to lower volumes, but in most cases, Japanese size and standard sleeves fall within the same price range
Rotation in sight #15 When the game released I had high hopes it would be more like the OG card game up until the B/W era and the influx of EX and "everything is basic" sentiment the game has (would agree that the SP already started it but B/W as the final nail in the coffin)
However, if no Humans have died under your control so far this turn as your end step begins, the ability won't trigger at all
For safekeeping Pokmon cards in mint condition, the toploaders are your best option
And that is a totally fine way to collect for someone who has the ability and budget to do so