Regidrago, the Grizzled Maw

{e}{e}, Put a menace counter onto target creature you control.

This creature gains the keywords of other Golems you control. If you control three or
more Golems, this creature gains +2/+0.

Regidrago was discovered recently, and seems to constantly be emanating large amounts of energy. The dragon's head it carries remains unidentified for the time being.