Opponents could counter this Pok-Power by afflicting Gengar LV.X with a status condition, but not every deck was equipped with Pokmon that could do so
The deck focuses on casting an army of vampire creatures, many of which make tokens, and then using a variety of sacrifice outlets to generate massive value and overwhelm your opponent
While they generally work better in mono colored decks, they can be put into decks that lean heavily into one color over another
Its also the de facto leader of the Doctor Who Blast from the Past precon, so most of those cards are already historic permanents or cards that care about historic, such as many of the other Doctors and their companions
Heliod, Sun-Crowned Heliod, Sun-Crowned makes you work for your counters, but its one of the most reliable lifegain payoffs in the game
Hes on the lower of the fun side, but still makes the cut