Steelix

Steelix (125/182), the Rare from Paradox Rift, has an estimated ungraded market price of about $0.25. Note: 22 other cards named Steelix exist across the sets Riffle tracks, at very different values; check the collector number.

This page covers Steelix (125/182), the Rare (about under $1) from Paradox Rift.

The other versions: #H23/147 from Aquapolis (Holo Rare, about $290–$390); #H29/144 from Skyridge (Holo Rare, about $155–$200); #87/95 from Unleashed (Rare PRIME, about $105–$140); #31/144 from Skyridge (Rare, about $70–$95); #35/147 from Aquapolis (Rare, about $46–$60); #15/111 from Neo Genesis (Rare, about $42–$55); #208/182 from Paradox Rift (Illustration rare, about $35–$46); #247/236 from Cosmic Eclipse (Secret Rare, about $16–$22); #150/132 from Mega Evolution (Illustration rare, about $7–$9); #79/116 from Plasma Freeze (Rare, about $3–$5); #28/100 from Stormfront (Rare, about $3–$5); #23/100 from Sandstorm (Rare, about $3–$5); #24/95 from Unleashed (Rare, about $3–$5); #38/130 from Diamond & Pearl (Rare, about $3–$4); #89/168 from Celestial Storm (Rare, about $3–$4); #139/236 from Cosmic Eclipse (Rare, about under $1); #125/214 from Lost Thunder (Rare, about under $1); #104/236 from Unified Minds (Rare, about under $1); #99/163 from Battle Styles (Holo Rare, about under $1); #139/264 from Fusion Strike (Holo Rare, about under $1); #093/132 from Mega Evolution (Rare, about under $1); #044/78 from Pokémon GO (Uncommon, about under $1).

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