Which Xerneas EX do you have?
Same name, 10× the price: $1.51 to $16 raw. The difference is printed on the card — it is just not somewhere most people think to look.
Xerneas-EX & Yveltal-EX Super Legend Set · #012
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
no PSA data
Promo Card Pack 25th Anniversary Edition · #023
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.
$11
93% gem
XY Base · #97
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.
$7.00
28% gem
XY Black Star Promos · #XY07
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.
$5.85
4.8% gem
Celebrations: Classic Collection · #97
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.
$5.08
67% gem
Premium Champion Pack · #090
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.
$4.99
76% gem
M Master Deck Build Box Power Style · #023
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.
$4.98
83% gem
XY Black Star Promos · #XY149
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.
$4.25
15% gem
Xerneas-EX & Yveltal-EX Super Legend Set · #011
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.
$2.73
no PSA data
Scarlet & Violet Promos · #179
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.
$1.51
11% 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.