
Whenever a creature an opponent controls enters, you may have that player lose 1 life.
Blood Seeker has 3 printings, first in Zendikar (2009). EDHREC ranks it #2,741 among Commander cards. It appears most in Valgavoth, Harrower of Souls decks (23,557 on EDHREC). 1 public deck on TCG runs it. It has 1 official ruling.
Deck counts from EDHREC.
Cards that show up in the same decks on EDHREC.