You want to spend the early stages of the game deploying mana rocks, ramping towards your demons, and using your sweepers and single-target removal spells to keep problematic cards in check
Black didnt have a cheap and reliable removal spell like Lightning Bolt or Path to Exile before this was printed, and Push revolutionzed black removal when it was printed
The Legend Maker Mew is far more valuable than this version, clocking in at around $150 a common theme among some of the best Collections cards
Also, Pokmon BREAK cards are important for strategy in more ways than just their ability to be used in battle
You could replace the rare dual lands with some common tapped dual lands, and it would still function, but it would be less competitive because we'll have to play off-curve sometimes
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