1000-THR Earthmover

This spell costs {x} less to cast, where X is
the total mana value of noncreature artifacts
you control.
Sacrifice two artifacts, return the Earthmover
from your graveyard to your hand.
—
"Earthmovers were the pinnacle of the arms race.
Often called the horsemen of the apocalypse."
(Replacer for Metalwork Colossus)