Bolterrigon of Copper and Zinc

{1}: Bolterrigon gains flying until end of turn.
Put a steam counter on Bolterrigon.
{1}: Bolterrigon gains trample until end of turn. Put a steam counter on Bolterrigon.
Whenever Bolterrigon attacks, it deals X damage
to its controller; where X is the number of steam counters on Bolterrigon.
{t}: Remove two steam counters from Bolterrigon.