Blood Seeker 
Creature — Vampire Shaman
Whenever a creature an opponent controls enters, you may have that player lose 1 life.
Legality
standardNOT LEGALpioneerNOT LEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL
Creature — Vampire Shaman
Whenever a creature an opponent controls enters, you may have that player lose 1 life.