When Gleaming Overseer enters the battlefield, amass 1. (Put a +1/+1 counter on an Army you control. If you don't control one, create a 0/0 black Zombie Army creature token first.) Zombie tokens you control have hexproof and menace.
NM-Mint - $0.50
Lightly Played - $0.45
Moderately Played - $0.40
Heavily Played - $0.35
Damaged - $0.25
NM-Mint Non English - $0.50
Lightly Played Non English - $0.45
Moderately Played Non English - $0.40
Heavily Played Non English - $0.35
Damaged Non English - $0.25