gyarados pokemon card value 1st Edition Base Set Holo PSA 9 – Kanto Shark your opponent takes 2 Prize cards. Gyarados - Trading Card Game
Description
This is why a set of four of the same card is commonly referred to as a Playset of that cardits the maximum number of copies of that card that can be included in a deck

The only "disadvantage" is self-gating one of your own dorks on color back to your hand
Using standard MTG sizing is important because it keeps cards compatible with sleeves, deck boxes, binders, playmats, and existing collections

Since it is an item, two can also be used in a single turn if the player has both in their hand

Only one of each card was produced specifically to give to these winners, so only one of each exists

That is a real size difference that makes standard international sleeves noticeably too loose for Japanese cards
