The most valuable card illustrated by Eri Yamaki is Donphan (SWSH Black Star Promos) at $50, ahead of Seviper ($34) and Mimikyu ($18).
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 Eri Yamaki card is Donphan (SWSH Black Star Promos) at $50, followed by Seviper (SM Black Star Promos) $34, Mimikyu (Team Up) $18, Gengar (Sword & Shield) $11, Alolan Ninetales (Cosmic Eclipse) $8. Prices are TCGplayer market for raw copies (any condition) and refresh daily.
TickerMint tracks 38 Pokemon cards illustrated by Eri Yamaki across 42 printings, with a combined market value of $152 counting each card once at its priciest printing.