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Costs around $3 at the moment, and allowed in every format
That is to say, while the various sets used one checklist for its cardssay, perhaps, Aquapolis Quagsire was numbered 30/147 Nintendo also kept track of e-Reader cards using their own systemthe same Aquapolis Quagsire had an e-Reader ID of C-38-#
This scarcity resulted in incredible sales of $5,000 for a graded 10 Slowking, although raw Near Mint copies can still be sourced for approximately $115
Counterfeiters find it nearly impossible to replicate it exactly
The copied artifact stays in play, even if the original goes to the graveyard, which means a player can use it to get some pretty powerful artifacts on their side and gain the upper hand against more seasoned players with stronger decks