Metalwork Colossus

This spell costs {x} less to cast, where X is the
total mana value of noncreature artifacts you
control.
Sacrifice two artifacts: Return Metalwork
Colossus from your graveyard to your hand.
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The Imperator - Class Titan is considered to be
one of the strongest weapons of the Imperium of man.
The Necrons have survived far worse.