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 - $5.70
Lightly Played - $5.10
Moderately Played - $4.60
Heavily Played - $4.00
Damaged - $2.90
NM-Mint Non English - $5.70
Lightly Played Non English - $5.10
Moderately Played Non English - $4.60
Heavily Played Non English - $4.00
Damaged Non English - $2.90