
You draw X cards and you lose X life, where X is your devotion to black. (Each {B} in the mana costs of permanents you control counts toward your devotion to black.)
Sanguimancy has 1 printing, first in Born of the Gods (2014). EDHREC ranks it #20,068 among Commander cards. It appears most in Zodiark, Umbral God decks (101 on EDHREC). It has 4 official rulings.
Deck counts from EDHREC.
Cards that show up in the same decks on EDHREC.