why do some pokemon cards have yellow border

why do some pokemon cards have yellow border Are these stains on the of my vintage cards? Or just this as part of the design? (Secret wonders Mew) : r/PokemonTCG My favorite yellow border card

Name: why do some pokemon cards have yellow border Are these stains on the of my vintage cards? Or just this as part of the design? (Secret wonders Mew) : r/PokemonTCG My favorite yellow border card
Brand: standardengineering.in
SKU: 41752999820
Price: 21.88 USD
Availability: InStock
Rating: 4.2916 (9 reviews)

SKU: 41752999820

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USD21.88 USD61.88

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Description

This battle is truly sad

Znajdziesz produkcje inspirowane mitologi, filmami akcji, wiatem przygody, a take kolorowymi owocwkami w nowej odsonie

Replicating Ring

I think Im correct in saying that this is the cheapest (in terms of mana cost) one-sided card draw doubling effect we have now, so although it doesnt double your normal draw step, this is a no-brainer to slot into most blue decks