Silverbluff Bridge

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

Workshop Assistant

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

Metallic Rebuke

Improvise (Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for {1}.)
Counter target spell unless its controller pays {3}.

Ichor Wellspring

When this artifact enters or is put into a graveyard from the battlefield, draw a card.

Seat of the Synod

Candy Trail

When this artifact enters, scry 2.
{2}, {T}, Sacrifice this artifact: You gain 3 life and draw a card.

Ashnod's Altar

Urza's Tower

{T}: Add {C}. If you control an Urza's Mine and an Urza's Power-Plant, add {C}{C}{C} instead.

Lembas

When this artifact enters, scry 1, then draw a card.
{2}, {T}, Sacrifice this artifact: You gain 3 life.
When this artifact is put into a graveyard from the battlefield, its owner shuffles it into their library.

Mistvault Bridge

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

Drossforge Bridge

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

Urza's Mine

{T}: Add {C}. If you control an Urza's Power-Plant and an Urza's Tower, add {C}{C} instead.

Vault of Whispers

Swamp

Myr Enforcer

Affinity for artifacts (This spell costs {1} less to cast for each artifact you control.)

Etherium Sculptor

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

Makeshift Munitions

{1}, Sacrifice an artifact or creature: This enchantment deals 1 damage to any target.

Foundry Inspector

Darksteel Citadel

Myr Retriever

Deadly Dispute

As an additional cost to cast this spell, sacrifice an artifact or creature.
Draw two cards and create a Treasure token. (It's an artifact with "{T}, Sacrifice this token: Add one mana of any color.")

Great Furnace

Thoughtcast

Affinity for artifacts (This spell costs {1} less to cast for each artifact you control.)
Draw two cards.

Krark-Clan Shaman

Sacrifice an artifact: This creature deals 1 damage to each creature without flying.

Fanatical Offering

As an additional cost to cast this spell, sacrifice an artifact or creature.
Draw two cards and create a Map token. (It's an artifact with "{1}, {T}, Sacrifice this token: Target creature you control explores. Activate only as a sorcery.")

Urza's Power Plant

{T}: Add {C}. If you control an Urza's Mine and an Urza's Tower, add {C}{C} instead.