Magikarp

Magikarp (17/111), the Common from Crimson Invasion, has an estimated ungraded market price of about $0.40. Note: 30 other cards named Magikarp exist across the sets Riffle tracks, at very different values; check the collector number.

This page covers Magikarp (17/111), the Common (about under $1) from Crimson Invasion.

The other versions: #203/193 from Paldea Evolved (Illustration rare, about $330–$430); #75/144 from Skyridge (Common, about $80–$110); #118/165 from Expedition Base Set (Common, about $28–$37); #64/107 from Deoxys (Common, about $9–$11); #65/109 from Team Rocket Returns (Common, about $8–$11); #52/110 from Legendary Collection (Uncommon, about $7–$9); #67/112 from FireRed & LeafGreen (Common, about $6–$8); #65/100 from Stormfront (Common, about $5–$7); #60/97 from Dragon (Common, about $4–$6); #35/102 from Base Set (Uncommon, about $3–$4); #47/82 from Team Rocket (Uncommon, about $2–$4); #30/113 from Legendary Treasures (Common, about $2–$4); #110/147 from Supreme Victors (Common, about $2–$4); #61/95 from Call of Legends (Common, about $2–$3); #50/130 from Base Set 2 (Uncommon, about $2–$3); #72/123 from HeartGold SoulSilver (Common, about $2–$3); #39/192 from Rebel Clash (Common, about $1–$2); #89/123 from Mysterious Treasures (Common, about $1–$2); #23/124 from Dragons Exalted (Common, about about $1); #22/83 from Generations (Common, about $0.70–$1); #19/70 from Dragon Majesty (Common, about under $1); #32/147 from Burning Shadows (Common, about under $1); #29/181 from Team Up (Common, about under $1); #15/68 from Hidden Fates (Common, about under $1); #33/108 from Evolutions (Common, about under $1); #042/193 from Paldea Evolved (Common, about under $1); #19/98 from Ancient Origins (Common, about under $1); #021/78 from Pokémon GO (Common, about under $1); #129/165 from 151 (Common, about under $1); #044/198 from Scarlet & Violet (Common, about under $1).

The collector number printed at the bottom of the card is the reliable way to tell them apart.