Copper Golem

When copper golem enters the battlefield put
four decay counters on it. At the beginning of
your upkeep remove a decay counter from
Copper Golem, then if there are no more decay counters on Copper Golem it becomes a
non-creature artifact.
{t}: Add one mana of any color
{1}, {t}: Add two decay counters to Copper golem
They really like to push your buttons