Frigid Gear Golem

Frigid Gear Golem enters the battlefield with two
charge counters on it.
Creatures attacking you or planeswalkers you
control get -1/-0 for each charge counter on
Frigid Gear Golem.
{1},{t}: Put a charge counter on target artifact.
This ability costs {1} more for each charge
counter on Frigid Gear Golem.