Like most Pokmon cards, the value of Caterpie depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (HeartGold & SoulSilver)
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1 Traditional foil full-art Eldrazi land 1 of 5 full-art Eldrazi basic lands 1 Non-foil common or uncommon retro frame card or full-art Snow-Covered Wastes In addition to the full-art Snow-Covered Wastes found in this slot (2.6%), here you will find a selection of commons and uncommons from MH1, MH2, and MH3 all brought into the retro frame
In fact, writing this article has increased my desire to obtain one of the classic oversized cards just to have it on displayits probably the only way Id allow myself to purchase a Juzam Djinn anymore