They're rarely valuable, but in terms of collectibility, they're a fantastic card to have in your collection
If you combine other tricks, "Gizmek Orochi, the Serpentron Sky Slasher" is good, you can get the corresponding card of level 7 or less from the Deck, and you can also collect the removed cards
According to TPC, over 52.9 billion Pokmon cards had been printed as of March 2023

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If you banish from the field, you have to return a Dragon you control to the hand