Trigon of Corruption (Scars of Mirrodin)

This artifact enters with three charge counters on it. {B}{B}, {T}: Put a charge counter on this artifact. {2}, {T}, Remove a charge counter from this artifact: Put a -1/-1 counter on target creature.

NM - $0.50
LP - $0.50
MP - $0.50
HP - $0.50
DMG - $0.50