Emet-Selch, Unsundered/Hades, Sorcer of Eld
Graveyard Hate Tutors Prime Speaker Vannifar can be a repeatable tutor: by and sacrificing another creature at sorcery speed, we search our library for a creature card with mana value equal to 1 plus the sacrificed creatures mana value, we put that card onto the battlefield, then shuffle
10 Knight Of The Ebon Legion This particular one-mana Knight was a key player in black aggro and midrange strategies during its tenure in Standard, and still sees play in Pioneer and Explorer
Not only is he a massive vehicle, meaning he can dodge board wipes, but hes a counter AND draw engine
Making creature tokens isn't a bad effect, but the mana generation provided by treasure is much better for chaining together spells