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Cadaverous Bloom - $6.16 Set: Mirage (MIR) Cadaverous Bloom is a very intriguing card

Simply put, the simple, focused strategies usually do the best, and it's hard to do much simpler than Counter-Burn

Cost reductions always useful in green, and decks that want this sort of effect could use more mana sinks

The Power 9 is a set of cards from the Alpha, Beta and Unlimited sets and are worth over a million dollars

It's also good on the turn you drop it

As with most things in Magic, however, I encourage you to do your own research on Gatherer or Scryfall as well there are a lot of blue mass removal spells beyond those in this post, and while they will generally be the best options for many blue Commander decks, some metagames and strategies can allow you to benefit a lot from a niche effect or specialized variation