how to know the value of a pokemon card

how to know the value of a pokemon card original cards I found from childhood : r/PokemonCardValue Pokemon Card Value - Check

Name: how to know the value of a pokemon card original cards I found from childhood : r/PokemonCardValue Pokemon Card Value - Check
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Description

You get tons of card advantage, drawing three cards while each of your opponents discard one

When this creature dies, incubate X, where X is its power

Doesnt matter

Being auctioned off alongside the base set booster boxes will be a collection of 83 mint edition cards from the 2000s Team Rocket expansion, with a previous copy of the expansion being sold at a recent auction for 2,400 ($3,267), as well as a 1st edition Dark Blastoise holo-card that is expected to go for around 120 ($163)