The following cards in black and green will allow you to search your library for a sorcery, and possibly other cards:
- Bringer of the Black Dawn
- Cruel Tutor
- Demonic Collusion
- Demonic Tutor
- Diabolic Intent
- Diabolic Revelation
- Diabolic Tutor
- Entomb (tutors to the graveyard)
- Grim Tutor
- Imperial Seal (tutors to the top of the library)
- Increasing Ambition
- Infernal Tutor
- Insidious Dreams
- Liliana Vess (tutors to the top of the library)
- Rhystic Tutor
- Rune-Scarred Demon
- Sidisi, Undead Vizier
- Vampiric Tutor (tutors to the top of the library)
I've highlighted the cards with converted mana cost 3 or less.
There are also black cards with Transmute, which allows you to pay {1}{B}{B} and discard that card to search for a card with the same CMC:
In addition, Demonic Consultation isn't exactly a tutor, but it does let you get a specific card out of your library into your hand, at the cost of exiling every card above it, and with a chance of exiling your whole library without finding it. Spoils of the Vault has a similar effect, except that you're guaranteed to find the card if it's in there, but you lose 1 life for each card exiled.
