Voltaic Key

Voltaic Construct

Twitch

You may tap or untap target artifact, creature, or land.
Draw a card.

Filigree Sages

Dross Scorpion

Whenever this creature or another artifact creature dies, you may untap target artifact.

Galvanic Key

Urza, Prince of Kroog

Artifact creatures you control get +2/+2.
{6}: Create a token that's a copy of target artifact you control, except it's a 1/1 Soldier creature in addition to its other types.

Corridor Monitor

When this creature enters, untap target artifact or creature you control.

Clock of Omens

Tap two untapped artifacts you control: Untap target artifact.