Dark Hatchling says "When Dark Hatchling enters the battlefield, destroy target nonblack creature
Beyond the combos themselves, these are by far the most interesting part of the deck
At every playtest of the decks, I would get feedback about coworkers favorite characters, story moments, etc
You care about what happens to them whereas there werent any characters that you could apply that same feeling to before
Still, adding in sweepers (especially cards like Earthquake and Star of Extinction that take advantage of Sevinne, the Chronoclasm's damage-prevention ability) can greatly improve the deck, and there are some interesting ways to cast cards from our graveyard, like Snapcaster Mage, Mission Briefing and Torrential Gearhulk
Be'lakor, the Dark Master, despite its wonky ETB effect, is the perfect 3-color legend to lead any demons typal deck, as well