Hide on the Ceiling

Exile X target artifacts and/or creatures. Return the exiled cards to the battlefield under their owners' control at the beginning of the next end step.

Emissary Escort

This creature gets +X/+0, where X is the greatest mana value among other artifacts you control.

Crystal Barricade

Defender (This creature can't attack.)
You have hexproof. (You can't be the target of spells or abilities your opponents control.)
Prevent all noncombat damage that would be dealt to other creatures you control.

Oaken Siren

Flying, vigilance
{T}: Add {U}. Spend this mana only to cast an artifact spell or activate an ability of an artifact source.

Weapons Manufacturing

Whenever a nontoken artifact you control enters, create a colorless artifact token named Munitions with "When this token leaves the battlefield, it deals 2 damage to any target."

Voyager Glidecar

When this Vehicle enters, scry 1.
Tap three other untapped creatures you control: Until end of turn, this Vehicle becomes an artifact creature and gains flying. Put a +1/+1 counter on it.
Crew 1

Magitek Infantry

This creature gets +1/+0 as long as you control another artifact.
{2}{W}: Search your library for a card named Magitek Infantry, put it onto the battlefield tapped, then shuffle.