Biggest fallers over the last 30 days, by TCGplayer median. Historical movement — not investment advice.
14 cards moving ≥ 10%.

Galarian Slowpoke
SWSH Black Star Promos

Gengar ex
Temporal Forces

Latias
Sun & Moon Black Star Promos

Entei
Paldean Fates

Hero's Cape
Temporal Forces

Eevee
Evolving Skies

Champions Festival
SWSH Black Star Promos

Hawlucha
Scarlet & Violet Black Star Promos

Maractus
Black Bolt

Light Toxtricity
SWSH Black Star Promos

Squirtle
SWSH Black Star Promos

N's Darmanitan
Scarlet & Violet Black Star Promos

Latios
Sun & Moon Black Star Promos

Mimikyu
Paldean Fates