old Cartoon with sandstorm, old man, magical cave

I remember this movie (or maybe it was an episode of a show).  The only parts that I remember are there being a sandstorm in a desert, I believe there was something with quicksand, some mysterious old man, and this cave with shining crystals that talked and said “goodbye”.  I had originally thought that it was a Speed Racer episode, but I couldn’t find any episodes that matched the description.

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