Lets see what has changed from our base list
The -3 lets you destroy a target creature, and finally, the -6 gives you an emblem that states "whenever you gain life, target opponent loses that much life." Given that this card only costs four mana to cas t, it, like most of Witherbloom, is quite finely balanced and should see plenty of play across Standard and Commander
Its going to take some work, but he goes into great detail on the strategy here
Carnage in Commander When it comes to Commander, a few shells will shine better than others with Carnage, Crimson Chaos
Each one solves fundamental problems that the majority of decks face while providing exceptional value across multiple archetypes
(2019-10-04) Players can only respond once this spell has been cast and all its costs have been paid