Rhantzor, the Scavenged

Rhantzor can only be blocked by a number of creatures equal to the number of counters on it.
You can only cast Rhanztor from your graveyard.
When you cast Rhantzor, put a +1/+1 counter on it for each time it has been cast. Put an additional +1/+1 counter on it for each artifact in your graveyard.
{0}: Destroy Rhnatzor.