Grond, the Wolf's Head

Crew 6 (Tap any number of creatures you control
with total power 6 or more: This Vehicle becomes an
artifact creature until end of turn.)
Great engines crawled across the field, and in the
midst was a huge ram, great as a forest-tree a
hundred feet in length, swinging on mighty chains.
Long had it been forging in the dark smithies of
Mordor, and its hideous head, founded of black steel,
was shaped in the likeness of a ravening wolf.