Sheoldred, the Apocalypse is one of the most popular mono-black commanders
Until end of turn, it gains haste and "Whenever this creature deals damage, destroy target Equipment attached to it." Shackles of Treachery can target any creature, including one that's already untapped or one that doesn't have any Equipment attached to it
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Jegantha, the Wellspring gets played in almost any Red or Green deck that wants to just draw an extra card once in a while (even if it's a crappy 5/5 for five)
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An example are Magician of Black Chaos (Ritual Monster) and Black Magic Ritual (Ritual Spell Card)