Most of the valuable trainers in the Pokemon TCG are heroic figures, but even villains boast an impressive demand to support a solid roster of valuable cards
Back then, the plane was being taken over by the Eldrazi - basically MTGs versions of the eldritch old gods - and the already horror-themed inhabitants were being warped into new, and substantially more tentacly, shapes
I also just realized might strain the budget a bit, although the List version is less than half the price of the original, so it can be had at a comparatively reasonable price
Purphoros has ended more games of EDH than 99% of other red cards
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They're niche cards, so nobody else at the table will be interested in taking them