Glass Casket

When Glass Casket enters, exile target creature an opponent controls with mana value 3 or less until Glass Casket leaves the battlefield.

Plains

Steel Overseer

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

Gingerbrute

Haste (This creature can attack and {T} as soon as it comes under your control.)
{1}: Gingerbrute can't be blocked this turn except by creatures with haste.
{2}, {T}, Sacrifice Gingerbrute: You gain 3 life.

Sparring Construct

When Sparring Construct dies, put a +1/+1 counter on target creature you control.

Shambling Suit

Shambling Suit's power is equal to the number of artifacts and/or enchantments you control.

Court Homunculus

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

Spare Supplies

Spare Supplies enters tapped.
When Spare Supplies enters, draw a card.
{2}, {T}, Sacrifice Spare Supplies: Draw a card.

Chief of the Foundry

Other artifact creatures you control get +1/+1.

Patchwork Automaton

Ward {2} (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays {2}.)
Whenever you cast an artifact spell, put a +1/+1 counter on Patchwork Automaton.