![Slither Wing [Master Ball] #87 from Pokemon Japanese Terastal Festival](https://pokeinvest-japanese-card-images.nyc3.cdn.digitaloceanspaces.com/Terastal_Festival/402_Slither_Wing_87.jpg)
Slither Wing [Master Ball] #87 PSA 10: price & population
PSA 10
$39.99
Raw
$9.32
PSA 10 pop
574
Gem rate
90.1%
A PSA 10 Slither Wing [Master Ball] #87 from Japanese Terastal Festival sells for $39.99 — a 329% premium over the $9.32 raw price. PSA has graded this card 637 times; 574 came back a 10 (90.1% gem rate), and 53 a PSA 9.
The 9-to-10 spread
PSA 9 sells for $24.35. The jump from 9 to 10 is worth $15.64 — that spread, times your real odds of the 10, is what decides whether grading pays.
The September 2026 Grade Report ranks the 30 most profitable cards to grade right now, by expected profit after every fee. Same math as this page, run across the whole market. $29, one time, instant.
See the top 30 →Prices from real completed sales, updated daily. Population data from PSA's public population report.
