The most valuable card illustrated by Satoshi Shirai is Tyranitar (XY Black Star Promos) at $385, ahead of Gengar ex ($53) and Tyranitar ($50).
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 Satoshi Shirai card is Tyranitar (XY Black Star Promos) at $385, followed by Gengar ex (Temporal Forces) $53, Tyranitar (XY Black Star Promos) $50, Blastoise (Boundaries Crossed) $43, Lucario (Plasma Storm) $26. Prices are TCGplayer market for raw copies (any condition) and refresh daily.
TickerMint tracks 52 Pokemon cards illustrated by Satoshi Shirai across 53 printings, with a combined market value of $620 counting each card once at its priciest printing.