Gray Merchant of Asphodel 355 (Promo Pack: Theros Beyond Death)

When this creature enters, 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.)

NM - $14.10
LP - $11.30
MP - $8.50
HP - $5.70
DMG - $2.90