Gray Merchant of Asphodel

Gray Merchant of Asphodel {3}{B}{B}

Creature - Zombie | Power/Toughness: 2 / 4 (CMC 5)
When Gray Merchant of Asphodel enters the battlefield, each opponent loses X life, where X is your devotion to black. You gain life equal to the life lost this way. (Each {B} in the mana costs of permanents you control counts toward your devotion to black.)