Foundry Inspector

Artifact spells you cast cost {1} less to cast.

Myr Reservoir

{T}: Add {C}{C}. Spend this mana only to cast Myr spells or activate abilities of Myr.
{3}, {T}: Return target Myr card from your graveyard to your hand.

All Is Dust

Each player sacrifices all permanents they control that are one or more colors.

Tezzeret, Master of the Bridge

Creature and planeswalker spells you cast have affinity for artifacts. (They cost {1} less to cast for each artifact you control.)
+2: Tezzeret, Master of the Bridge deals X damage to each opponent, where X is the number of artifacts you control. You gain X life.
−3: Return target artifact card from your graveyard to your hand.
−8: Exile the top ten cards of your library. Put all artifact cards from among them onto the battlefield.

Palladium Myr

Steel Overseer

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

Myr Propagator

{3}, {T}: Create a token that's a copy of Myr Propagator.

Darksteel Citadel

Island

Swamp

Silver Myr

Leaden Myr

Thirst for Knowledge

Draw three cards. Then discard two cards unless you discard an artifact card.

Myr Galvanizer

Other Myr creatures you control get +1/+1.
{1}, {T}: Untap each other Myr you control.

Myr Matrix

Indestructible (Effects that say "destroy" don't destroy this artifact.)
Myr creatures get +1/+1.
{5}: Create a 1/1 colorless Myr artifact creature token.