Which Championship Arena do you have?
Same name, 3× the price: $560 to $1,425 raw. The difference is printed on the card — it is just not somewhere most people think to look.
Nintendo Black Star Promo · #028
Check the set symbol in the lower right of the illustration, and the copyright year along the bottom edge. Those two identify the print run on every card that has them.
$1,425
no PSA data
PCG-P Promos · #117
Check the set symbol in the lower right of the illustration, and the copyright year along the bottom edge. Those two identify the print run on every card that has them.
$560
35% gem
We have no hand-checked note for these printings yet, so the guidance above is the general rule rather than something specific to this card.
Prices are raw market value. Click a printing for its full grading verdict — the gem rate, the fees and whether it beats selling raw.