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The current titleholder of most valuable Gengar of all time goes to the Japanese Masaki Promo Holo from 1999, which received a TAG 10 grade, and sold for $101,260 through Goldin

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Another quick aside: All the creatures with changeling that were turned over from design had the ability to change themselves in some way most often by changing their power or toughness (you'd be surprised how many basic ways there are to do this, from firebreathing to Looming Shade pumping to the Rootwalla ability) and all the spells changed something else (Giant Growth, Shrink, Afflict, and such)

Examine the card texture and attribute clarity