This has directly contributed to Eevee Heroes cards sometimes commanding higher prices than their Evolving Skies equivalents, despite the English market historically being larger
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27 Spells Lion's Eye Diamond Mana Crypt Mox Opal Chrome Mox Lotus Petal Goblin Bushwhacker Gitaxian Probe Mana Vault Faithless Looting Elixir of Immortality Recoup Ruby Medallion Helm of Awakening Goblin Electromancer Grapeshot Manamorphose Pyretic Ritual Desperate Ritual Scroll Rack Grim Monolith Seething Song Wheel of Fortune Priest of Urabrask Simian Spirit Guide Empty the Warrens Memory Jar Reforge the Soul 13 Lands Great Furnace Seat of the Synod Ancient Tomb City of Traitors Volcanic Island Scalding Tarn Steam Vents Shivan Reef Cascade Bluffs 4 Mountains Other possible sensible cards Ignite Memories Past in Flames Mox Diamond Goblin Welder Lotus Bloom Chromatic Star Sensei's Divining Top Wild Guess Voltaic Key Other possible tenuous cards Gut Shot Lava Dart Gamble Storm Entity Scattershot (just to up the storm count) Ground Rift (just to up the storm count) As this is such an early evolution of the archetype the list is likely quite a bit off, usually in the ratios of things

As you can imagine, it is not easy slapping a valuation on it
Although selling old Pokmon cards can bring in thousands of dollars, this is not the most effortless process, which requires specific rules to be followed, such as knowledge of your collection, the correct presentation of information, high-quality photos, and the right platform for selling Pokmon cards