Which Karen do you have?
Same name, 13× the price: $15 to $197 raw. The difference is printed on the card — it is just not somewhere most people think to look.
The Best of XY · #183
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.
$197
63% gem
Alternate Art Promos · #XY177a
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.
$50
no PSA data
XY Promos · #256
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.
$30
76% gem
The Best of XY · #142
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.
$16
80% gem
XY Black Star Promos · #XY177
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.
$15
6.6% 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.