The most valuable card illustrated by Keisin is Cinccino ex (Chaos Rising) at $47, ahead of Drifblim ($22) and Mienshao ($11).
Value counts each card once at its highest-priced printing. The homepage leaderboard additionally requires a priced rarity cohort, so its totals run slightly leaner.
By TCGplayer market price, the most valuable Keisin card is Cinccino ex (Chaos Rising) at $47, followed by Drifblim (SVP Black Star Promos) $22, Mienshao (White Flare) $11, Cottonee (White Flare) $10, Furfrou (Prismatic Evolutions) $8. Prices are TCGplayer market for raw copies (any condition) and refresh daily.
TickerMint tracks 11 Pokemon cards illustrated by Keisin across 20 printings, with a combined market value of $105 counting each card once at its priciest printing.