Red-Eyes Dark Dragoon (Quarter Century Secret Rare) from 25th Anniversary Rarity Collection II (1st Edition) fell 11.5% to $21.06 on Oct 20, 2026, the biggest one-day drop among Yu-Gi-Oh singles priced $20 or more, per TickerMint.
Source: TickerMint (tickermint.cards), Oct 20, 2026. https://tickermint.cards/wire/2026-10-20-yugioh-top-decliner