It seems good, but expensive
They generally have stronger attacks and lower HP scores than their regular counterparts of the time, and come in both holographic and non-holographic varieties (although the holographic versions are naturally more valuable)
Sources: August 8, 2023 Pokmon Presents, NCL
Also being able to kill X/4 creatures for red decks is huge: cards like Primeval Titan, Tarmogoyf, Deaths Shadow and many more were a nightmare for red based decks, but now you have a very good and versatile tool in Unholy Heat
You can also play the Themed format, which is the least used format
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