Sorin makes your vampires bigger, pushes them through blockers, gains life so you can race (and afford more Adanto Vanguard activations), and is a repeatable removal spell for creatures, planeswalkers, and players
This spell makes you draw a card for each Human you control
If an effect would let you cast a spell or activate an ability of a card from a zone other than your hand (e.g., flashback), that card will appear floating to the right of your hand with a white fog around it unless you are specifically focused on the zone it is located in
Its one of the most efficient Auras for multiplayer formats, providing a steady stream of Gold tokens that let you outpace the competition without committing your own creatures to the red zone
Path of Ancestry Path of Ancestry is similar to Cavern of Souls in that it fixes your mana and it gives you some other bonus
You can also sacrifice lands , although typically to fetch other lands