Darksteel Myr

Indestructible (Damage and effects that say "destroy" don't destroy this creature. If its toughness is 0 or less, it's still put into its owner's graveyard.)

Tree of Tales

Swords to Plowshares

Exile target creature. Its controller gains life equal to its power.

Goldmire Bridge

This land enters tapped.
Indestructible
{T}: Add {W} or {B}.

Dispatch

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

Command Tower

{T}: Add one mana of any color in your commander's color identity.

Slagwoods Bridge

This land enters tapped.
Indestructible
{T}: Add {R} or {G}.

Alloy Myr

Ancient Den

Lightning Greaves

Equipped creature has haste and shroud. (It can't be the target of spells or abilities.)
Equip {0}

Great Furnace

Arcane Signet

Rustvale Bridge

This land enters tapped.
Indestructible
{T}: Add {R} or {W}.

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.

Darksteel Citadel

Razortide Bridge

This land enters tapped.
Indestructible
{T}: Add {W} or {U}.

Perilous Myr

When this creature dies, it deals 2 damage to any target.

Palladium Myr

Leaden Myr

Myr Retriever

When this creature dies, return another target artifact card from your graveyard to your hand.

Myr Galvanizer

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

Shimmer Myr

Flash
You may cast artifact spells as though they had flash.

Cultivate

Search your library for up to two basic land cards, reveal those cards, put one onto the battlefield tapped and the other into your hand, then shuffle.

Skullclamp

Equipped creature gets +1/-1.
Whenever equipped creature dies, draw two cards.
Equip {1}

Urtet, Remnant of Memnarch

Whenever you cast a Myr spell, create a 1/1 colorless Myr artifact creature token.
At the beginning of combat on your turn, untap each Myr you control.
{W}{U}{B}{R}{G}, {T}: Put three +1/+1 counters on each Myr you control. Activate only during your turn.

Counterspell

Myr Superion

Spend only mana produced by creatures to cast this spell.

Urza's Incubator

As this artifact enters, choose a creature type.
Creature spells of the chosen type cost {2} less to cast.

Steel Overseer

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

Tanglepool Bridge

This land enters tapped.
Indestructible
{T}: Add {G} or {U}.

Terramorphic Expanse

{T}, Sacrifice this land: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.

Foundry Inspector

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

Path of Ancestry

This land enters tapped.
{T}: Add one mana of any color in your commander's color identity. When that mana is spent to cast a creature spell that shares a creature type with your commander, scry 1. (Look at the top card of your library. You may put that card on the bottom.)

Mistvault Bridge

This land enters tapped.
Indestructible
{T}: Add {U} or {B}.

Copper Myr

Vault of Whispers

Tempered Steel

Artifact creatures you control get +2/+2.

Hovermyr

Silver Myr

Iron Myr

Gold Myr

Commander's Sphere

{T}: Add one mana of any color in your commander's color identity.
Sacrifice this artifact: Draw a card.