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.)
Near Mint - $0.70
Lightly Played - $0.60
Played - $0.50
Heavily Played - $0.40
Damaged - $0.40
Near Mint Non-English - $0.70
Lightly Played Non-English - $0.60
Played Non-English - $0.50
Heavily Played Non-English - $0.40
Damaged Non-English - $0.40