When Gray Merchant of Asphodel 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.)
Near Mint - $1.50
Lightly Played - $1.30
Played - $1.10
Heavily Played - $0.90
Damaged - $0.80
Near Mint Non-English - $1.50
Lightly Played Non-English - $1.30
Played Non-English - $1.10
Heavily Played Non-English - $0.90
Damaged Non-English - $0.80