Vauban, The Bastion

Metalcraft — As long as you control three or
more artifacts, double the amount of counters
you would put on any noncreature artifact you
control.
Artifact creatures you control cost {1} less to cast
for each noncreature artifact you control.
Tap an untapped noncreature artifact you
control: Tap or untap target noncreature artifact
and put a charge counter on it.