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
Simply put, the simple, focused strategies usually do the best, and it's hard to do much simpler than Counter-Burn
Sacrifice it at the beginning of the next end step.) , Sacrifice this creature: It deals damage equal to the number of creatures you control to target creature
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