Like most Pokmon cards, the value of Houndoom 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 (Great Encounters)
The trading system can be considered this
Great Unclean One makes your opponents lose life each turn with the potential to put tokens into play
I claim that the Magic system, which was designed to be resonant and trope-y and archetypal, does a lot of the same good work that naming things does, and is a richer intuition pump than other popular wrong-but-usefuls like Enneagram or MBTI or chakras or the integral theory colors
They are most likely backups or second picks for other, stronger cards, but if you need redundancy, these cards might be worth playing
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