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 - £0.50
Lightly Played - £0.50
Moderately Played - £0.40
Heavily Played - £0.30
Damaged - £0.20
Near Mint Non English - £0.50
Lightly Played Non English - £0.50
Moderately Played Non English - £0.40
Heavily Played Non English - £0.30
Damaged Non English - £0.20