Silverbluff Bridge

Silverbluff Bridge enters tapped.
Indestructible
{T}: Add {U} or {R}.

Great Furnace

Mistvault Bridge enters tapped.
Indestructible
{T}: Add {U} or {B}.

{1}, {T}, Sacrifice Chromatic Star: Add one mana of any color.
When Chromatic Star is put into a graveyard from the battlefield, draw a card.

{T}, Sacrifice Lotus Petal: Add one mana of any color.

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

Whenever an artifact is put into a graveyard from the battlefield, you may have target opponent lose 1 life.

Drossforge Bridge enters tapped.
Indestructible
{T}: Add {B} or {R}.

When Ichor Wellspring enters or is put into a graveyard from the battlefield, draw a card.

Sacrifice an artifact: Krark-Clan Shaman deals 1 damage to each creature without flying.

As an additional cost to cast this spell, sacrifice a creature.
Fling deals damage equal to the sacrificed creature's power to any target.

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