Gray Merchant of Asphodel [Theros Beyond Death]

Set: Theros Beyond Death Type: Creature — Zombie Rarity: Uncommon Cost: {3}{B}{B} 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.)