Pia is a mana sink, offers a wide array of utility both as a threat and as a sac outlet and is generally all round good
While the end goal is similar to greens ramp decks generate a huge amount of resources to play something game-winning black isnt interested in steadily building up resources
I dont think that the ability to destroy artifacts and enchantments is all that relevant, but incidentally is the way that I prefer my Disenchants to come anyway
Wrap Up Black Market Connections | Illustration by Evyn Fong Enchantments translate well to Commander since they often represent long-term value, which is what you want in a multiplayer format
She also makes Artifacts and Enchantments that trigger upon entry and death much better, like Ichor Wellspring, Hopeless Nightmare, Mephitic Draught, and Mycosynth Wellspring
First, Master of Crueltiess ability will trigger, setting that opponents life total to 1