The lower you go, typically the less tax there will be because of the opportunity cost of choosing to Tera your Sirfetch'd instead of the Ogerpon-H in any given game
The Fiend's heads effect lets it pop a monster and inflict burn damage to its controller whenever it battles, while its tails effect basically Dark Holes the entire board when it battles
The concept is cool, and after Equipment, its the best addition to the game by far since legendary permanents
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Poison decks tend to incite a lot of hate from other players since it puts them on a deadline, and removing poison counters is all but impossible outside of a few niche cards
But it's not great when you compare the bang for your buck, since most normal Commander decks cost $40 - $50