Magmortar

Magmortar (19/156), the Rare from Ultra Prism, has an estimated ungraded market price of about under $1. Note: 15 other cards named Magmortar exist across the sets Riffle tracks, at very different values; check the collector number.

This page covers Magmortar (19/156), the Rare (about under $1) from Ultra Prism.

The other versions: #123/123 from Mysterious Treasures (Rare Holo LV.X, about $55–$75); #GG03/70 from Crown Zenith Galarian Gallery (Rare, about $11–$16); #12/123 from Mysterious Treasures (Rare Holo, about $6–$9); #16/95 from Call of Legends (Rare Holo, about $6–$8); #2/95 from Unleashed (Rare Holo, about $5–$7); #27/102 from Triumphant (Rare, about $5–$7); #6/147 from Supreme Victors (Rare Holo, about $3–$5); #31/132 from Secret Wonders (Rare, about $2–$3); #21/124 from Dragons Exalted (Rare, about $1–$2); #11/111 from Furious Fists (Rare, about $0.80–$1); #22/236 from Unified Minds (Rare, about under $1); #30/192 from Rebel Clash (Rare, about under $1); #021/159 from Journey Together (Rare, about under $1); #020/172 from Brilliant Stars (Rare, about under $1); #010/91 from Paldean Fates (Rare, about under $1).

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