First, whenever a creature you control dies, each opponent has to exile a creature of their own--this reminds me of a card like Grave Pact, only better because the casting cost is two Black versus three Black and exiling is better than sacrificing
Similar to Silverback Elder but costing less is a huge factor here, even if it might be easier to cast a creature rather than commit a crime
Copies of each can be had for around $0.50 these days, which is hardly exciting
This has led to Cyclonic Rift becoming an auto-include for any blue deck in Commander, and the merit of its banning has been a heated topic of discussion for years
Khrn the Betrayer This is perhaps the wildest card I've ever made
It ensures that after the massacre, the Dragon player will still have a flying threat to get them ahead in the next few turns