Affordable koraidon ex gold For Sale

Can someone explain to me how my Koraidon ex shot up in value over 160% overnight? Was a $145 card, is now $454?? This doesn't usually happen…right? Usually as time goes by

Pokemon Scarlet & Violet Koraidon EX SECRET RARE GOLD CARD 254/198 ENGLISH M-GM

Pokemon - Miraidon ex 253/198 - Scarlet & Violet - Secret Rare - Gold Holo Foil : Toys & Games

Is this a rare card? : r/PokemonTCG

Pokemon Scarlet & Violet Koraidon EX SECRET RARE GOLD CARD 254/198 ENGLISH M-GM

Pokémon TCG: Scarlet & Violet Booster Display Box (36 Packs)

Pokemon - Miraidon ex 227/198 - Scarlet & Violet - Ultra Rare - Holo Full Art : Toys & Games

106/078}Koraidon ex UR

Pokémon Scarlet And Violet Koraidon EX/Ultra Rare GOLD 254/198 NM

Koraidon ex Scarlet Violet 254/198 Values - MAVIN

Pokémon Koraidon EX GOLD 254/198 Scarlet & Violet Secret Rare NM Free Shipping

Koraidon ex Scarlet Violet 254/198 Values - MAVIN

Pokémon TCG: Scarlet & Violet Booster Display Box (36 Packs)