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 - $0.90
Lightly Played - $0.70
Moderately Played - $0.60
Heavily Played - $0.50
Damaged - $0.40
Near Mint Spanish - $0.90
Lightly Played Spanish - $0.70
Moderately Played Spanish - $0.60
Heavily Played Spanish - $0.50
Damaged Spanish - $0.40