When Contagion Clasp enters the battlefield, put a -1/-1 counter on target creature. {4}, {T}: Proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)
NM-Mint - $0.50
Lightly Played - $0.50
Moderately Played - $0.50
Heavily Played - $0.40
Damaged - $0.40
NM-Mint Non English - $0.50
Lightly Played Non English - $0.50
Moderately Played Non English - $0.50
Heavily Played Non English - $0.40
Damaged Non English - $0.40