Portable Hole

When Portable Hole enters, exile target nonland permanent an opponent controls with mana value 2 or less until Portable Hole leaves the battlefield.

Voltaic Servant

At the beginning of your end step, untap target artifact.

Spire of Industry

{T}: Add {C}.
{T}, Pay 1 life: Add one mana of any color. Activate only if you control an artifact.

Memnite

Make Disappear

Casualty 1 (As you cast this spell, you may sacrifice a creature with power 1 or greater. When you do, copy this spell and you may choose a new target for the copy.)
Counter target spell unless its controller pays {2}.

Tempered Steel

Artifact creatures you control get +2/+2.

Island

Iron Apprentice

Iron Apprentice enters with a +1/+1 counter on it.
When Iron Apprentice dies, if it had counters on it, put those counters on target creature you control.

Tocatli Honor Guard

Creatures entering don't cause abilities to trigger.

Court Homunculus

Court Homunculus gets +1/+1 as long as you control another artifact.

Plains

Springleaf Drum

{T}, Tap an untapped creature you control: Add one mana of any color.

Tormod's Crypt

{T}, Sacrifice Tormod's Crypt: Exile target player's graveyard.

Master of Etherium

Master of Etherium's power and toughness are each equal to the number of artifacts you control.
Other artifact creatures you control get +1/+1.

Steel Overseer

{T}: Put a +1/+1 counter on each artifact creature you control.

Dispatch

Tap target creature.
Metalcraft — If you control three or more artifacts, exile that creature.