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.)
NM-Mint - $4.20
Lightly Played - $4.00
Moderately Played - $3.80
Heavily Played - $3.30
Damaged - $2.70
NM-Mint Non English - $4.20
Lightly Played Non English - $4.00
Moderately Played Non English - $3.80
Heavily Played Non English - $3.30
Damaged Non English - $2.70