The most valuable card illustrated by Takashi Yamaguchi is Gengar (Triumphant) at $561, ahead of Lugia ($260) and Raichu ($138).
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 Takashi Yamaguchi card is Gengar (Triumphant) at $561, followed by Lugia (HGSS Black Star Promos) $260, Raichu (Undaunted) $138, Haunter (Triumphant) $80, Meganium (HeartGold SoulSilver) $67. Prices are TCGplayer market for raw copies (any condition) and refresh daily.
TickerMint tracks 20 Pokemon cards illustrated by Takashi Yamaguchi across 20 printings, with a combined market value of $1,287 counting each card once at its priciest printing.