Black has always had its share of powerful cards throughout MTGs history, be it powerful Alpha cards like Dark Ritual and Demonic Tutor or more recent cards like Grief and Archon of Cruelty
Summon flocks of Faeries or buff your creatures with the aid of the Wild Court, the choice is yours in the Wilds of Eldraine Commander decks
Making things worse, Zenos yae Galvuss front side is basically a worse Harvester of Misery
Kaalia of the Vast helps you cheat big angels into play, while Kaalia, Zenith Seeker keeps your hand full by digging for more threats
One of the best cards at fulfilling this purpose is Zeraora, and its coin flip attack is also energy efficient
That, to me, is enough to slot these pretty much anywhere you can find space