The most valuable card illustrated by Kyoko Koizumi is Dark Tyranitar (Team Rocket Returns) at $265, ahead of Dark Crobat ($176) and Dark Steelix ($140).
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 Kyoko Koizumi card is Dark Tyranitar (Team Rocket Returns) at $265, followed by Dark Crobat (Team Rocket Returns) $176, Dark Steelix (Team Rocket Returns) $140, Dark Ariados (Team Rocket Returns) $80, Unown (Unseen Forces Unown Collection) $53. Prices are TCGplayer market for raw copies (any condition) and refresh daily.
TickerMint tracks 15 Pokemon cards illustrated by Kyoko Koizumi across 15 printings, with a combined market value of $1,087 counting each card once at its priciest printing.